Patent Publication Number: US-9836921-B2

Title: Gaming machine

Description:
CROSS REFERENCE TO RELATED APPLICATION 
     The present application claims priority from Japanese Patent Applications No. 2014-161679 filed on Aug. 7, 2014, and No. 2015-033813 filed on Feb. 24, 2015, the disclosures of which are herein incorporated by reference in its entirety. 
     BACKGROUND OF THE INVENTION 
     Field of the Invention 
     The present invention relates to a gaming machine. 
     Traditionally, among gaming machines such as slot machines, there are ones which award a bonus upon establishment of a predetermined condition (e.g., when a bonus symbol stop-displayed). For example, there has been known a gaming machine which awards a game media such as coins or run a special game such as a free game, in response to establishment of the predetermined condition. 
     Among the gaming machines configured to award a bonus, there are ones with a plurality of bonus types, which are configured to select one of the bonus types, in response to an operation of a button and the like by a player, and award a bonus of the selected bonus type (see for example U.S. Unexamined Patent Application Publication No. 2009/0104973 and U.S. Pat. No. 7,578,736B2). 
     With the gaming machine with a plurality of bonus types as described above, players usually plays a game with their attentions attracted to the bonus types and selection of the bonus types. 
     In view of the above, an object of the present invention is to provide a gaming machine which achieves a new entertainment characteristic by adding a new characteristic to selection of a bonus type from a plurality of bonus types. 
     SUMMARY OF THE INVENTION 
     A gaming machine of the present invention comprise: a display configured to display a plurality of selectable images in a bonus game which is triggered in a normal game, in which a bonus type is selected out of a plurality of bonus types with stepwisely differentiated advantageous levels, wherein the selectable images are changed to any one of bonus rank images corresponding to the plurality of bonus types every time selection is made; a selection input device which enables selection of one of the selectable images on the display; and a controller configured to execute the normal game and a bonus game, and to control the display so that, of the bonus rank images displayed, only the number of the bonus rank images corresponding to the bonus determined in advance in the bonus game reaches a predetermined number, wherein the controller causes the display to display a bonus rank image corresponding to a high rank bonus type out of the plurality of bonus types, before the number of the bonus rank images corresponding to the bonus determined in advance reaches the predetermined number. 
     In an effect display of the above-structure, a bonus rank image corresponding to a high rank bonus type out of the plurality of bonus types is displayed, before the number of the bonus rank images corresponding to the bonus determined in advance reaches the predetermined number. This achieves a new entertainment characteristic such that the player playing the bonus game expects for a high rank bonus, irrespective of the rank of the bonus type determined, until the bonus type is informed. 
     Further, in the gaming machine of the present invention, the controller may determine one of a first mode and a second mode in the bonus game, the first mode being a mode in which a part of all the bonus rank images to be displayed on the display are determined in advance, the second mode being a mode in which all the bonus rank images to be displayed on the display are randomly determined. 
     In the above structure, the effect display of the bonus game whose result is determined in advance is performed in various patterns, which contributes to improvement of the entertainment characteristic. 
     The gaming machine of the present invention may further comprise a symbol display device configured to display a game result by rearranging a plurality of symbols including one or more specific symbols in a symbol display region, in the normal game, wherein, wherein the symbols rearranged in the symbol display regions include one or more specific symbols, the controller randomly determines whether to trigger the bonus game with a probability corresponding to the number of the specific symbols rearranged. 
     With the above-described structure, whether or not the bonus game is triggered is randomly determined with a probability according to the number of the specific symbols rearranged. As described, the bonus game unexceptionally yielding a bonus is randomly determined according to the normal game result for which the player has placed a bet. That is, by rearranging the one or more specific symbols in the symbol display region in the normal game, it is possible to perform random determination that could be advantageous to the player, which contributes to an improvement of the entertainment characteristic of the game. 
     Further, the gaming machine of the present invention may further comprise a bet input device capable of receiving a bet whose amount is designated by a player, wherein the controller runs a normal game on condition that a bet is placed, and when the one or more specific symbols are rearranged in the symbol display region, executes a first random determination to randomly determine whether to trigger the bonus game with a probability according to the number of the specific symbols and the bet amount. 
     With the above-described structure, whether or not the bonus game is triggered is randomly determined with a probability according to the number of the specific symbols rearranged and the bet amount. Thus, the probability of having the bonus game, unexceptionally yielding a bonus, result from the random determination improves with an increase in the bet amount. This consequently suggests the player that the larger the bet amount, the more the advantages will be, and improves the possibility of increasing the gain of the gaming machine administrator. 
     Further, in the gaming machine of the present invention, the display may have a region which displays a count for each types of bonus rank images, and every time the bonus rank image is displayed, the controller may count the number for each type of bonus rank images displayed, every time the bonus rank image is displayed, and indicate the count of each type of bonus rank images in the region which displays the count. 
     The above structure clearly indicating the count of each type of bonus rank images during the bonus game improves the user friendliness. 
     Further, in the gaming machine of the present invention, the bonus rank images may include a type that indicates a number greater than one, and when a selectable image is changed to that type of bonus rank image indicating a number greater than one, the controller may count up by the number indicated by the type of bonus rank image. 
     The above structure provides variation to a monotonous effect that simply changes the selectable image to a bonus rank image in the bonus game, thus contributing to improvement of the entertainment characteristic. 
     Further, in the gaming machine of the present invention, when the one or more specific symbols are rearranged in the symbol display region, the controller randomly determines whether to trigger the bonus game with a probability according to the number of specific symbols rearranged, and further executes a second random determination apart from the first random determination, to determine whether to trigger the bonus game every time the normal game is run. 
     The above structure performs random determination of whether to run the bonus game in every normal game, in addition to the random determination of whether to run the bonus game, which is performed when the one or more specific symbols are rearranged. This provide more variation to the condition of starting the bonus game, and contributes to improvement of the entertainment characteristic. 
     The present invention is provides a gaming machine which achieves a new entertainment characteristic by adding a new characteristic to selection of a bonus type from a plurality of bonus types. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an explanatory diagram of a gaming machine. 
         FIG. 2  is an explanatory diagram of the gaming machine. 
         FIG. 3  is an explanatory diagram showing an example payout table. 
         FIG. 4  is a diagram showing an example symbol array for a normal game. 
         FIG. 5  is a diagram showing an example symbol array for the normal game. 
         FIG. 6  is a diagram showing an example symbol array for the normal game. 
         FIG. 7  is a diagram showing an example symbol array for the normal game. 
         FIG. 8  is a diagram showing an example symbol array for the normal game. 
         FIG. 9  is a diagram showing an example symbol array for a free game. 
         FIG. 10  is a diagram showing an example symbol array for the free game. 
         FIG. 11  is a diagram showing an example symbol array for the free game. 
         FIG. 12  is a diagram showing an example symbol array for the free game. 
         FIG. 13  is a diagram showing an example symbol array for the free game. 
         FIG. 14  is a diagram showing the specific symbols and their percentages in the normal game. 
         FIG. 15  is a diagram showing the specific symbols and their percentages in the free game. 
         FIG. 16  is an explanatory diagram of a trigger state of the bonus game. 
         FIG. 17  is an explanatory diagram showing a functional flow of the gaming machine. 
         FIG. 18  is an explanatory diagram showing the functional flow of the gaming machine. 
         FIG. 19  is an explanatory diagram showing a connection structure of a game system. 
         FIG. 20  is a block diagram of the game system. 
         FIG. 21  is a block diagram of a PTS system. 
         FIG. 22  is a perspective view of a slot machine in the gaming machine. 
         FIG. 23  is an electrical block diagram of the gaming machine. 
         FIG. 24  is an explanatory diagram showing an example normal game screen on a lower image display panel. 
         FIG. 25  is a diagram of a screen showing a payout table which is displayed on the upper image display panel. 
         FIG. 26  is an explanatory diagram of a trigger state of the free game. 
         FIG. 27  is an explanatory diagram of a display screen in the free game. 
         FIG. 28  is an explanatory diagram of a display screen in a selection game. 
         FIG. 29  is an explanatory diagram of a display screen in the selection game. 
         FIG. 30  is an explanatory diagram of a scenario table. 
         FIG. 31  is an explanatory diagram of an example display screen in the bonus game. 
         FIG. 32  is an explanatory diagram of an example display screen in the bonus game. 
         FIG. 33  is an explanatory diagram of an example display screen in the bonus game. 
         FIG. 34  is an explanatory diagram of an example display screen in the bonus game. 
         FIG. 35  is an explanatory diagram of an example display screen in the bonus game. 
         FIG. 36  is an explanatory diagram of a progressive challenge table. 
         FIG. 37  is an explanatory diagram of a random determination method in a progressive challenge table. 
         FIG. 38  is an explanatory diagram of a mystery random determination table. 
         FIG. 39  is an explanatory diagram of a progressive random determination table. 
         FIG. 40  is a flowchart of a normal game running process. 
         FIG. 41  is a flowchart of a free game running process. 
         FIG. 42  is a flowchart of a bonus game running process. 
         FIG. 43  is an explanatory diagram showing a help screen. 
         FIG. 44  is an explanatory diagram of a win effect screen. 
         FIG. 45  is an explanatory diagram of a win effect screen. 
         FIG. 46  is an explanatory diagram of a win rank. 
         FIG. 47  is an explanatory diagram of a win meter. 
         FIG. 48  is an explanatory diagram of a control panel. 
         FIG. 49  is an explanatory diagram showing an example display screen on a lower image display panel. 
         FIG. 50  is an explanatory diagram showing an example display screen on a lower image display panel. 
         FIG. 51  is a flowchart of a gamble game running process. 
         FIG. 52  is an explanatory diagram of screens in a gamble game. 
         FIG. 53  is an explanatory diagram of an operation sequence in a gamble game. 
         FIG. 54  is an explanatory diagram of an operation sequence in a gamble game. 
         FIG. 55  is an explanatory diagram of an operation sequence in a gamble game. 
         FIG. 56  is an explanatory diagram of an operation sequence in a gamble game. 
         FIG. 57  is a diagram showing an example symbol array for the free game. 
         FIG. 58  is a diagram showing an example symbol array for the free game. 
         FIG. 59  is a diagram showing an example symbol array for the free game. 
         FIG. 60  is a diagram showing an example symbol array for the free game. 
         FIG. 61  is an explanatory diagram showing an example display screen on a lower image display panel in a modification. 
         FIG. 62  is an explanatory diagram showing an example display screen on an upper image display panel in the modification. 
         FIG. 63  is an explanatory diagram showing an example help screen in the modification. 
         FIG. 64  is an explanatory diagram showing a wild symbol random determination table in the modification. 
         FIG. 65  is an explanatory diagram showing a top symbol random determination table in the modification. 
         FIG. 66  is a flowchart of a normal game running process in the modification. 
         FIG. 67  is an explanatory diagram showing an example display screen on a lower image display panel in a modification. 
         FIG. 68  is an explanatory diagram showing an example display screen on a lower image display panel in the modification. 
         FIG. 69  is an explanatory diagram of a progressive initial value table in the modification. 
         FIG. 70  is an explanatory diagram of a progressive default increment rate table in the modification. 
         FIG. 71  is an explanatory diagram showing a first bonus game random determination table in the modification. 
         FIG. 72  is an explanatory diagram showing a second bonus game random determination table in the modification. 
         FIG. 73  is an explanatory diagram showing an example help screen in the modification. 
         FIG. 74  is a diagram showing an example symbol array for the normal game in the modification. 
         FIG. 75  is a diagram showing an example symbol array for the free game in the modification. 
         FIG. 76  is a diagram showing an example symbol array for the free game in the modification. 
         FIG. 77  is a diagram showing an example symbol array for the normal game in the modification. 
         FIG. 78  is a diagram showing an example symbol array for the free game in the modification. 
         FIG. 79  is a diagram showing an example symbol array for the normal game in the modification. 
         FIG. 80  is a diagram showing an example symbol array for the free game in the modification. 
         FIG. 81  is a diagram showing an example symbol array for the normal game in the modification. 
         FIG. 82  is a diagram showing an example symbol array for the free game in the modification. 
         FIG. 83  is an explanatory diagram showing an example display screen on a lower image display panel in the modification. 
         FIG. 84  is an explanatory diagram of a coin sorting table in the modification. 
         FIG. 85  is an explanatory diagram showing an example display screen on a lower image display panel in the modification. 
         FIG. 86  is an explanatory diagram showing an example display screen on a lower image display panel in the modification. 
     
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     The following describes a gaming machine of the present invention with reference to attached drawings. 
     (Gaming Machine Over View: Increasing the Types and the Number of Specific Symbols for Each Additional Bet) 
     As shown in  FIG. 1 , a gaming machine of the present embodiment is configured to variably displaying symbol arrays in which the types and the number of the specific symbols are increased with an additional bet. Specifically, a slot machine  10  (gaming machine  300 ) has a lower image display panel  141  serving as a symbol display device. On the lower image display panel  141 , a plurality of symbol arrays  170  with a plurality of symbols  501  including normal symbols  502  and specific symbols  503  more advantageous than the normal symbols  502  are variably displayed, and then a game result is displayed by rearranging the symbols  501  in a symbol display region  150  containing a matrix of cells  28  (see  FIG. 8 , also referred to as display blocks  28 ). 
     The slot machine  10  further includes a control panel  30  serving as a bet input device capable of receiving a bet whose bet amount is designated by a player. The control panel  30  has credit buttons  40  to  44  (play-1 credit button  40 , play-5 credit button  41 , play-15 credit button  42 , play-30 credit button  43 , and play-60 credit button  44 ), and is configured to enable setting of the bet amount step by step. In the following description, bets based on the credit buttons  40  to  44  are referred to as “symbol bet (SBB) 1, 5, 15, 30, 60”. The slot machine  10  runs a normal game which rearranges symbols  501  on the lower image display panel  141  on condition that a bet is placed. Further, the slot machine  10  is configured to modify the symbols  501  arrayed in the plurality of symbol arrays  170 , so that the ratios of the specific symbols  503  to the total number of the symbols  501  in all the symbol arrays  170  increases with an increase in the bet amount entered by the player. 
     As described, the percentages of the specific symbols  503  which are more advantageous than the normal symbols  502  increase with an increase in the bet amount. This clearly suggests to the player that the game is played more advantageously with an increase in the bet amount, in the form of an increase in the percentage of the specific symbols  503 . This consequently improves the possibility of increasing the gain of the gaming machine administrator. 
     It should be noted that, by “specific symbols  503  which are more advantageous than the normal symbols  502 ”, it means rearrangement of a specific symbol  503  in the symbol display region  150  may lead to more advantageous game result than having a normal symbol  502  rearranged. By “more advantageous game result”, it means a larger amount of payout is awarded based on the game result. For example, in cases where a prize for symbols  501  is to be determined when a predetermined number or more of the symbols  501  are rearranged, the above expression means that a larger amount of payout is awarded for the specific symbols  503  than that awarded for the normal symbols  502 . 
     Further, the bet operation in the present embodiment is performed as follows. First, the player determines a value (later-detailed “symbol bet”) which forms a basis of the bet amount to be entered, by using credit buttons  40  to  44 . Then, the player selects the multiplying factor for the payout to be obtained, by using bet buttons  34  to  38  (1-bet button  34 , 2-bet button  35 , 3-bet button  36 , 5-bet button  37 , and 10-bet button  38 ) provided to the control panel  30 . As described, the bet amount may be determined based on the base value (“symbol bet”) associated with the credit buttons  40  to  44 . For example, when the play-60 credit button  44  and the 2-bet button  35  are selected, the bet amount is 60 credits×2=120 credits, and the payout rate will be a double. It should be noted that the bet buttons  34  to  38  and the credit buttons  40  to  44  can be operated in any order. 
     The specific symbols  503  includes a plurality of types with stepwisely differentiated advantage levels. As shown in  FIG. 3 , the specific symbols  503  include: a bat symbol  503   e , a gourd symbol  503   d  which is more advantageous than the bat symbol  503   e , a fish symbol  503   c  which is more advantageous than the gourd symbol  503   d , a pot symbol  503   b  which is more advantageous than the fish symbol  503   c , and a dragon symbol  503   a  which is more advantageous than the pot symbol  503   b . With an increase in the bet amount placed by the player, an increase in the percentage of the specific symbol  503  with a high advantage becomes possible. 
     In the present embodiment, the specific symbols  503   e ,  503   d ,  503   c ,  503   b , and  503   a  with stepwisely differentiated advantage levels correspond to credit buttons  40  to  44 , respectively. Further, increases in the percentages of the specific symbols corresponding to these credit buttons  40  to  44  become possible. 
     The way of modifying the symbol arrays  170  is not limited as long as the modified symbol arrays are advantageous according to the increase in the bet amount. For example, the normal symbols  502  may be modified to specific symbols  503  according to an increase in the bet amount. Further, the number of specific symbols  503  may be increased according to the increase in the bet amount. Further, the number of normal symbols  502  may be decreased according to the increase in the bet amount. Further, the above described ways of modifications may be implemented in combination. 
     In the present embodiment, a free game is run when a predetermined condition is satisfied during the normal game. In this free game too, the symbol arrays  170  may be modified to be more advantageous symbol arrays  170  according to an increase in the bet amount. Specifically, in the free game, a plurality of symbol arrays  170  different from those in the normal game are variably displayed on the lower image display panel  141 , and then symbols  501  are rearranged in the symbol display region  150 . Then, the symbols in the plurality of symbol arrays  170  are modified so that, the larger the bet amount placed in the normal game satisfying the predetermined condition, the higher the ratios of the specific symbols  503  to the number of the symbols  501  in all the symbol arrays  170  will be as compared with the percentage of the same in the normal game. 
     Exemplary symbol arrays  170  are shown in  FIG. 4  to  FIG. 13 .  FIG. 4  to  FIG. 8  show exemplary symbol arrays  170  corresponding to the symbol bets (i.e., base values of 1, 5, 15, 30, and 60) in the normal game.  FIG. 9  to  FIG. 13  show exemplary symbol arrays  170  corresponding to the symbol bets (i.e., base values of 1, 5, 15, 30, and 60) in the free game. Reels  1  to  5  shown in  FIG. 4  to  FIG. 13  correspond to later-described pseudo reels  151  to  155  and indicate symbol arrays  170   a  to  170   e  variably displayed, respectively. Further,  FIG. 14  and  FIG. 15  show percentages of the specific symbols  503  in the normal game and the free game in all the symbols. 
     As shown in  FIG. 14 , in the normal game, a symbol array  170  with only the bat symbol  503   e  taking many places therein is used for the symbol bet of 1. For the symbol bet of 5, a symbol array  170  with many bat symbols  503   e  and many gourd symbols  503   d  are used. For the symbol bet of 15, a symbol array  170  with many bat symbols  503   e , many gourd symbols  503   d , and many fish symbols  503   c  are used. For the symbol bet  30 , a symbol array  170  with many bat symbols  503   e , many gourd symbols  503   d , many fish symbols  503   c , and many pot symbols  503   b  are used. For the symbol bet  60 , a symbol array  170  with many bat symbols  503   e , many gourd symbols  503   d , many fish symbols  503   c , many pot symbols  503   b , and many dragon symbols  503   a  are used. As should be understood, there are specific symbols  503  to be permitted for each value of the symbol bet. 
     When symbol bets are compared with each other, all the specific symbols  503  are increased while the number of entire symbols is decreased, with an increase in the symbol bet. In short, the percentages of all the specific symbols  503  are increased with an increase in the symbol bet. In the present embodiment, all the symbols  501  in a single symbol array  170  are rearranged at the same probability. Since an increase in the symbol bet increases the percentages of the specific symbols  503 , the chances of obtaining an advantageous game result will increase. It should be noted that the percentage of the specific symbols  503  may be increased in any way, provided that the level of advantages to the player reflect the increase in the bet amount. 
     For example, as shown in  FIG. 15 , in the symbol bet of 1 for the free game, there are specific symbols  503  with higher percentages than those in the other symbol bets. However, in each reel, there is a significant difference in the number of a particular type of specific symbols  503  from the numbers of other types of specific symbols  503  so that the probability of obtaining a game result related to the specific symbols  503  is low. As described, the factors determining how easily a game result related to the specific symbols  503  is obtained is not limited to the numbers or the percentages of the specific symbols  503 . That is, the game may be configured to be more advantageous according to the bet amount, in terms of easiness of obtaining a game result related to the specific symbols  503 . 
     (Overview of Gaming Machine: Determining One Bonus Type Out of Plurality of Types of Bonuses with Stepwisely Differentiated Advantage Levels in Bonus Game) 
     As shown in  FIG. 2 , the gaming machine of the present embodiment determines a bonus type out of a plurality of types of bonuses respectively associated with stepwisely differentiated advantage levels in the bonus game. Specifically, in the slot machine  10  (gaming machine  300 ), the lower image display panel  141  displays a plurality of selectable images  1421  in the bonus game in which one type of bonus is determined out of the plurality of types of bonuses with stepwisely differentiated advantage levels (Grand Bonus, Major Bonus, Minor Bonus, Mini Bonus). The slot machine  10  has the control panel  30  serving as a selection input device enabling selection of one of the selectable images  1421  on the lower image display panel  141 . Every time a selectable image  1421  is selected with the control panel  30 , the selected selectable image  1421  is changed to any one of bonus rank images  1422  (Grand rank image  1422   a , Major rank image  1422   b , Minor rank image  1422   c , and Mini rank image  1422   d ) corresponding to the plurality of bonus types, respectively. It should be noted that the bonus may be hereinafter referred to as “progressive”, “jackpot”, or “progressive jackpot”. 
     The slot machine  10 , in the bonus game, determines one of the bonus types before an effect display related to the bonus game is provided. The slot machine  10  controls the lower image display panel  141  so that the number of the bonus rank images  1422  corresponding to the bonus determined reaches a predetermined number (e.g., four) in the effect display. That is, the player selects the selectable images  1421 , and when the number of a type of bonus rank images  1422  reaches the predetermined number, the player is entitled to the bonus type which corresponds to that type of bonus rank image  1422 . 
     Further, a bonus rank image  1422  corresponding to a high rank bonus type out of the plurality of bonus types is displayed in the effect display, before the number of the bonus rank images  1422  corresponding to the bonus determined in advance reaches the predetermined number. 
     As described, a bonus rank image  1422  corresponding to a high rank bonus type out of the plurality of bonus types is displayed in the effect display, before the number of the bonus rank images  1422  corresponding to the bonus determined reaches the predetermined number. This achieves a new entertainment characteristic such that the player playing the bonus game expects for a high rank bonus, irrespective of the rank of the bonus type determined, until the bonus type is informed. 
     The high rank bonus type in the present embodiment means the Grand Bonus and the Major Bonus; however, the high rank bonus type is not limited to these. For example, the high rank bonus type may be only the Grand Bonus which is the most advantageous bonus type. Further, in the effect display, the bonus rank image  1422  corresponding to the high rank bonus type does not necessarily have to be displayed. 
     For example, in the bonus game of the present embodiment, one of a first mode and a second mode in the bonus game is determined in advance. The first mode is a mode in which a part of all the bonus rank images  1422  to be displayed on the lower image display panel  141  are determined in advance (scenario mode). The second mode is a mode in which all the bonus rank images  1422  to be displayed on the lower image display panel  141  are randomly determined (random mode). In the first mode, a bonus rank image  1422  corresponding to a high rank bonus type is displayed, before the number of the bonus rank images  1422  corresponding to the bonus determined in advance as the result of the bonus game reaches the predetermined number. In the second mode on the other hand, all the types of the bonus rank images  1422  are randomly determined Therefore, there is a possibility that the bonus rank image  1422  corresponding to the high rank bonus type may not be displayed. 
     Further, the normal game displays the game result by rearranging a plurality of symbols  501  in the symbol display region  150  on the lower image display panel  141 , as hereinabove described. Here, the plurality of symbols  501  include wild symbols  505  (see  FIG. 3 ) serving as the specific symbol. When the symbols rearranged in the symbol display region  150  include one or more wild symbols  505 , the slot machine  10  randomly determines whether to trigger the bonus game, with a probability corresponding to the number of wild symbols  505  rearranged. This random determination of whether to trigger the bonus game is further influenced by the above described bet amount. 
     Specifically, as shown in  FIG. 3 , the wild symbols  505  include normal wild symbols  505   a  (WILD) and a double wild symbols  505   b  (2×WILD). As shown in  FIG. 8  to  FIG. 13 , one normal wild symbol  505   a  is arranged in each of the reels  2  and  4  (pseudo reels  152 ,  154 ). As shown in  FIG. 8  to  FIG. 13 , one double wild symbol  505   b  is arranged in the reel  3  (pseudo reels  153 ). In the present embodiment, the random determination of whether to trigger the bonus game is performed when one or more wild symbols  505  is rearranged in the symbol display region  150   
     Further, the probability of winning of the bonus game is changed based on the number of wild symbols  505  rearranged. Specifically, the probability of winning the bonus game when two normal wild symbols  505   a  are rearranged is a double of the probability of winning the bonus game when one normal wild symbol  505   a  is rearranged (equivalent to two normal wild symbols  505   a ). Specifically, the probability of winning the bonus game when one double wild symbol  505   b  is rearranged is a double of the probability of winning the bonus game when one normal wild symbol  505   a  is rearranged (equivalent to two normal wild symbols  505   a ). The probability of winning the bonus game when all the wild symbols  505  (two normal wild symbols  505   a , and one double wild symbol  505   b ) are rearranged is 4 times the probability of winning the bonus game when one normal wild symbol  505   a  is rearranged. 
     Further, in regard to the effect display, the lower image display panel  141  is provided with a rank count region  1423  which is a region for counting each type of bonus rank images  1422 . The rank count region  1423  is provided with a predetermined number of count images  1423   a  for each type of the bonus rank image  1422 . Every time the bonus rank image  1422  is displayed, the number of the bonus rank images  1422  is counted for each type, and the count values are indicated on the rank count region  1423 . That is, of the predetermined number of count images  1423   a , a counted number of count images  1423   a  are changed to the same mode as the bonus rank images  1422 . 
     Further, as shown in  FIG. 2 , one selectable image  1421  is changed to a double bonus rank image  1422   e  indicating two bonuses of a bonus rank. Specifically, in  FIG. 2 , a double bonus rank image  1422   e  is displayed which showing two bonus rank images of the Grand rank. The double bonus rank image  1422   e  is counted as two bonus rank images  1422 . The double bonus rank image  1422   e  is displayed only for high ranks (i.e., Grand rank and Major rank). 
     Further, in the present embodiment, the above bonus game may be also triggered by the random determination executed every time the normal game is run. That is, when the symbols rearranged in the symbol display region  150  include one or more wild symbols  505 , the slot machine  10  executes the first random determination to determine whether to trigger the bonus game, with a probability corresponding to the number of wild symbols  505  rearranged, and further executes the second random determination, apart from the first random determination, to determine whether to trigger the bonus game every time the normal game is run. It should be noted that the bonus game triggered as the result of the second random determination is hereinafter referred to as mystery bonus. The bonus game is detailed later. 
     (Outline of Gaming Machine and Definitions of Terms: Definitions) 
     The slot machine  10  above is a kind of the gaming terminals in the gaming machine  300 . Although the present embodiment deals with the slot machine  10  as an example of the gaming terminal, the disclosure is not limited to this and any type of device having a terminal controller that is able to independently run a base game may be used as the gaming terminal. 
     The base game in the present embodiment is run by the slot machine  10 . The base game is a slot game where a plurality of symbols  501  are rearranged. The base game is not limited to the slot game but is any type of games capable of being independently run at a gaming terminal such as the slot machine  10 . In other words, the base game is a game in contrast to the common game. For example, a normal game and a bonus game are types of the base game. 
     The rearrangement of the symbols in the slot game is performed on the lower image display panel  141 . The slot game may have a normal game, a bonus game, and a rescue process, and the like. In the normal game, a process is executed in which the symbols are rearranged on the lower image display panel  141 , on condition that a gaming value is bet, and in which a normal payout is awarded according to the symbols rearranged. The bonus game is executed when the symbols are rearranged to meet a predetermined condition in the normal game. 
     The “bonus game” has a same meaning as a “feature game”. The bonus game may be any type of games as long as the bonus game is more advantageous than the normal game. Further, as long as the bonus game is advantageous to the player, i.e., more advantageous than the normal game to the player, the bonus game may be adopted in combination with another bonus game. For example, the bonus game may be a game that provides a player with a chance of winning more gaming values than the normal game or a game that provides a player with a higher chance of winning gaming values than the normal game. Alternatively, the bonus game may be a game that consumes fewer amounts of gaming values than the normal game. In the bonus game, these games may be provided alone or in combination. 
     For example, the bonus game may involve a fixed payout, or may be a free game that requires betting of a gaming value less than that required for playing the normal game (such a gaming value may include 0). Further, a symbol random determination table with higher payout rates than those for the normal game may be adopted. Further, the bonus game may be a pickup bonus which presents a plurality of choices to the player. In cases of the pickup bonus, the choices may include a fixed payout, a free game, and the like. Further, the choices of the pickup bonus may include a trigger for another pickup bonus game which allows the player to make another selection. It should be noted that the choices of the pickup bonus are preferably randomly arranged. Further, the content of the choices of the pickup bonus is preferably not displayed before the player makes the selection. The bonus game of the present embodiment is detailed later. The rescue process is executed when a rescue start condition is established. 
     A coin, a bill, or electrically valuable information corresponding to these is used as a gaming value. Note that the gaming value in the present invention is not particularly limited. Examples of the gaming value include game media such as medals, tokens, cyber money, tickets, and the like. A ticket is not particularly limited, and a later-mentioned barcoded ticket may be adopted for example. Further, as hereinabove described, the “gaming value” may be an electronic gaming point which corresponds to the game medium. 
     The “free game” is a game runnable with a bet of fewer gaming values than the normal game. Note that “bet of fewer amounts of gaming values” encompasses a bet of zero gaming value. The “free game” therefore may be a game runnable without a bet of a gaming value, which free game awards an amount of gaming values based on symbols  501  rearranged. In other words, the “free game” may be a game which is started without consumption of a gaming value. To the contrary, the “normal game” is a game runnable on condition that a gaming value is bet, which normal game awards an amount of gaming value based on the symbols  501  rearranged. In other words, the “normal game” is a game which starts with consumption of a gaming value. 
     The expression “rearrange” in this specification means dismissing an arrangement of symbols  501 , and arranging symbols  501  once again. The term “arrangement” indicates a state in which the symbols  501  are visually recognizable by an external player. 
     The phrase “base payout based on the rearranged symbols  501 ” means a normal payout corresponding to a rearranged winning combination. The phrase “bonus payout based on the rearranged symbols  501 ” means a bonus payout corresponding to a rearranged winning combination. Furthermore, the term “winning combination” indicates that a winning is established. Details of the winning combination will be given later. 
     (Functional Flow of Gaming Machine  300 : Slot Machine) 
     The gaming machine  300  arranged as above includes, as shown in  FIG. 17 , slot machines  10  and an external controller  621  (center controller  200 ) connected to the slot machines  10  to be able to perform data communications therewith. The external controller  621  is able to perform data communications with the slot machines  10  provided in a hall. 
     The slot machines  10  each include a bet button  601 , a spin button  602 , a display  614  (lower image display panel  141  of  FIG. 1  and the like), and a game controller  100  which controls these units. The BET button  601  and the spin button  602  are kinds of input devices. The slot machine  10  further includes a transceiver unit  652  that makes it possible to perform data communications with the external controller  621 . 
     The BET button  601  above has a function of receiving a bet amount input by the player. The spin button  602  has a function of receiving an instruction to start a game such as a normal game in response to an operation by the player, i.e., a start operation. The display  614  has a function of displaying still-image information and moving-image information. Examples of the still-image information are various types of symbols  501 , numeral values, and signs. Examples of the moving-image information include effect video. Furthermore, the display  614  has a touch panel  69  as an input device, and has a function of receiving various instructions input by a pressing operation by the player. The display  614  has a symbol display region  150 , an image display region  614   b , and a common game display region  614   c . The symbol display region  150  includes the reel device M 1  and displays the symbols  501  shown in  FIG. 1 . The image display region  614   b  displays various types of effect image information to be displayed during a game, in the form of a moving image or a still image. The common game display region  614   c  displays a common game. 
     For example, in the video display region  614   b , the effect display related to the bonus game as described above is performed. 
     Although in the present embodiment the symbol display region  150 , the region for displaying the selectable image  1421  in the bonus game, and the lower image display panel  141  are provided on the same screen, the disclosure is not limited to this arrangement. The common game display region  614   c  may be formed together with the symbol display region  150  and the image display region  614   b , or may appear as a substitute only when a common game is run. 
     The game controller  100  includes a coin insertion/start-check unit  603 , a normal game running unit  605 , a bonus game start determining unit  606 , a bonus game execution unit  607 , a random number sampling unit  615 , a symbol determining unit  612 , an effect-use random number sampling unit  616 , an effect determining unit  613 , a speaker unit  617 , a lamp unit  618 , a winning determining unit  619 , a payout unit  620 , and an indication effect unit  651 . 
     The normal game running unit  605  has a function of running a normal game on condition that the bet button unit  601  has been operated. The bonus game start determining unit  606  determines whether to run a bonus game, based on a combination of rearranged symbols  501  resulted from the normal game. That is to say, the bonus game start determining unit  606  has a function of determining that a bonus game is obtained when a trigger symbol  503   b  or the like is rearranged in a predetermined condition, and shifting the process to the bonus game running unit  607  so that a bonus game is run from the next unit game. 
     It is noted that “unit game” is a series of operations from the start of the receiving of a bet to a state in which an award can be established. For example, a unit game in the normal game includes a single bet time for receiving a bet, a single game time of rearranging stopped symbols  501 , and a single payout time of a payout process of awarding a payout. A unit game in the normal game is termed unit normal game. Note that, in the present embodiment, it takes three seconds from the start of variable-displaying the symbols by a player-operation of the spin button to rearrangement of the symbol; however, the present invention is not limited to this. 
     The bonus game running unit  607  has a function of running the bonus game which repeats a free game for a plurality of times, merely in response to an operation on the spin button  602 , and a function of selecting one of selectable images  1421  in the bonus game. 
     The symbol determining unit  612  has functions of: determining symbols  501  to be rearranged based on a random number given from the random number sampling unit  615 ; rearranging the determined symbols  501  in the symbol display region  150  of the display  614 ; outputting information on rearrangement of the rearranged symbols  501  to the winning determining unit  619  and an indication effect unit  651 ; and outputting an effect specifying signal to the effect-use random number sampling unit  616 , based on the rearrangement of the symbols  501 . 
     The winning determining unit  619  has functions of: determining whether a winning is achieved when information on symbols  501  rearranged and displayed on the display  614  is given; calculating a total amount of payout based on a winning combination formed when it is determined that a winning has been achieved; outputting to the payout unit  620  a payout signal which is based on the payout amount. The payout unit  620  has a function of paying out a gaming value to the player, in the form of a coin, a medal, a credit, or the like. Furthermore, the payout unit  620  has a function of adding credit data corresponding to the credit to be paid out to credit data stored in an IC card inserted into the later-described PTS terminal  700 . 
     In addition to the above, the game controller  100  includes a storage unit  661  that stores various types of bet amount data. The storage unit  661  stores data in a rewritable manner, e.g., a hard disk device and a memory. 
     In addition to the above, the game controller  100  has a common game running unit  653 . The common game running unit  653  has functions of: outputting bet amount information based on a bet amount bet on a normal game to the external controller  621  in each unit base game; executing a common game in response to a game start command from the external controller  621 ; and receiving a bet input through the BET button  601  for a bet amount corresponding to bet amount data for a common game, which is stored in the storage unit  661  and is bettable on a common game. 
     Further, the game controller  100  is connected to the PTS terminal  700 . The PTS terminal  700  is a unit in which an LCD, a microphone, a human body detection camera, etc. are integrated, and has, for example, a function of executing an effect for a game by mutual communications with the game controller  100 . In particular, the PTS terminal  700  has a card slot to which an IC card can be inserted. With this, the player is able to insert a IC card into the card slot and use the credits stored in the IC card in the slot machine  10 . 
     In addition to the above, when receiving credit data from the PTS terminal  700 , the game controller  100  updates the credit display on the display  614 . Furthermore, the game controller  100  outputs settled credit data to the PTS terminal  700  when the credits on a game are settled. 
     Furthermore, the PTS terminal  700  of each of the slot machines  10  constituting the gaming machine  300  is connected to the management server  800  to be able to communicate each other, and centrally manages the download of images, IC cards and credits. 
     (Functional Flow of Gaming Machine  300 : External Controller) 
     The slot machine  10  arranged as above is, as shown in  FIG. 18 , connected to the external controller  621 . The external controller  621  has a function of remotely operating and monitoring the operation state of each slot machine  10  and processes such as changes in game setting values. Furthermore, the external controller  621  has a function of determining a common game start condition for each gaming terminal which is the slot machine  10 , and executing a common game at a plurality of slot machines  10  when a determination result at any gaming terminal satisfies the common game start condition. 
     More specifically, the external controller  621  includes a common game start unit  6213 , a gaming terminal selection unit  6215 , and a transceiver unit  6217 . The common game start unit  6213  has functions of: determining whether the common game start condition is established based on the accumulated bet amount information sent from the slot machine  10  in each unit base game; outputting a game start command to a plurality of slot machines  10 ; and displaying on the common display device  700  states until the common game start condition is established. 
     The determination as to whether the common game start condition is established is based on the accumulated bet amount information or based on all accumulated values that increase as the unit base game is repeated. For example, the number of times of running the base game and the game time of the base game may be used as the accumulated values. 
     In addition to the above, the common game start unit  6213  has a function of outputting a game start command to the slot machine  10  in which an accumulated value that increases as a result of the repetition of the base game satisfies a game running condition. With this, because the right to participate in the common game is not awarded to a slot machine  10  in which the accumulated value is lower than the minimum setting value, the common game start unit  6213  motivates the player to actively repeat the base game. 
     In addition to the above, the common game start unit  6213  has a function of monitoring a non-input time in which no start operation is performed, and outputting the game start command to the slot machines  10  except to the slot machine  10  in which the non-input time is equal to or longer than a timeout time. With this, the common game start unit  6213  is able to determine that no player is at a slot machine  10  where the base game has not been played at least for the timeout time, and able to avoid the execution of the common game at such a slot machine  10 . 
     The gaming terminal selection unit  6215  has a function of selecting a specific slot machine  10  from the slot machines  10  and outputting a common game start command signal to that specific slot machine  10 . The common game start command signal provides the specific slot machine  10  with the right to start the common game. The transceiver unit  6217  has a function of exchanging data with the slot machines  10 . 
     (Operations of Gaming Machine  300 ) 
     The operations of the gaming machine  300  having the functional blocks above will be described. While in the present embodiment the “gaming terminal” shown in the flowcharts indicates a slot machine  10  executing a slot game, the disclosure is not limited to this arrangement. (Operations of Gaming Machine  300 ) 
     The operations of the gaming machine  300  having the functional blocks above will be described. While in the present embodiment the “gaming terminal” shown in the flowcharts indicates a slot machine  10  executing a slot game, the disclosure is not limited to this arrangement. 
     (Operations of Slot Machine  10 ) 
     A slot machine  10  which is a gaming terminal executes terminal-side processes. More specifically, to begin with, a base game process (e.g., normal game) is executed. That is, a series of operations below are executed. 
     (Coin-Insertion/Start-Check) 
     First, the slot machine  10  checks whether or not a bet button  601  has been pressed by a player, and subsequently checks whether or not a spin button unit  602  has been pressed by the player. 
     (Symbol Determination) 
     Next, when a spin button unit  602  has been pressed by the player, the slot machine  10  extracts a random number for symbol determination, and determines symbols  501  to be displayed for the player at the time of stopping the scroll of the symbol array  170 , for respective video reels displayed on a display unit  614 . 
     (Symbol Display) 
     Then the slot machine  10  starts the scroll of the symbol array  170  of each video reel, and stops the scroll so that the determined symbols  501  are displayed for the player. 
     (Winning Determination) 
     Subsequently, as the scrolling of the symbol array  170  of each video reel is stopped, the slot machine  10  determines whether the combination of the symbols displayed for the player is a combination related to winning. 
     (Payout) 
     When the combination of the symbols  501  displayed for the player is a combination related to winning, the slot machine  10  offers, to the player, benefit according to the combination. 
     For example, when a combination of symbols  501  related to a payout of coins has been displayed, the slot machine  10  pays out coins of the number corresponding to the combination of symbols  501  to the player. 
     Subsequently, whether to win a bonus combination is determined. When winning the bonus combination, a bonus game process is executed. Specifically, when a predetermined number or more of trigger symbols  504  are rearranged in the symbol display region  150 , running of the free game is determined and whether to run the bonus game is randomly determined. On the other hand, when not winning the bonus combination, the normal game is run again. During a period in which the base game including such a normal game and bonus game is being run, execution state information indicating the start and end of the unit game such as the normal game and the bet amount on the unit game is transmitted to the external controller  621 . With this, the external controller  621  centrally manages the execution state information of each slot machine  10 . 
     (Operation of External Controller  621 ) 
     When the slot machines  10  operate as above, the external controller  621  executes the following center-side processes in synchronization with the slot machines  10 . 
     To begin with, the external controller  621  receives the execution state information from each slot machine  10  and obtains the execution state of the base game. Thereafter, based on the number of the repetition of the base game, the accumulated bet amount, or the like, whether the common game start condition is established at any slot machine  10  is determined. When the common game start condition is not established, the acquisition of the execution state of the base game at each slot machine  10  is continued. 
     In the meanwhile, when the common game start condition is established, the game start command is simultaneously output to the slot machines  10  that satisfy the game running condition. Thereafter, a specific slot machine  10  is selected from the slot machines  10  satisfying the game running condition, and a common game start right instruction is output to the specific slot machine  10 . 
     Thereafter, the external controller  621  waits for the common game start command to be supplied from the specific slot machine  10 . Upon receiving the common game start command as the trigger, the result of the common game is determined as a game result. The game result is, for example, win, lose, or draw. When the game result is not draw, at least a part of a draw game result is skipped among a series of temporarily-stored game results, and the remaining game results are serially output to the slot machines  10 , as game result information. 
     Thereafter, based on the winning or losing game result, whether to win in the common game is determined. When lost, the execution state of the base game at each slot machine  10  is newly obtained. On the other hand, when won, a payout amount is calculated based on the bet amount bet on the common game at each slot machine  10 , and the payout amount is sent to each slot machine  10  as payout information. 
     (Entire Structure of Game System) 
     A game system  350  including the gaming machine  300  having the functions above will be described. 
     As shown in  FIG. 19 , the game system  350  includes the slot machines  10  and the external controller  621  connected to the slot machines  10  over a communication line  301 . 
     The external controller  621  is configured to control the slot machines  10 . In the present embodiment, the external controller  621  is a so-called hall server provided in a gaming facility where a plurality of slot machines  10  are provided. Each slot machine  10  has a unique identification number, and the external controller  621  determines the source of data sent from the slot machines  10  based on the identification number. Furthermore, the identification number is used to specify the transmission target, when data is sent from the external controller  621  to a slot machine  10 . 
     The game system  350  may be constructed in a single gaming facility where various games such as casino games are playable or constructed for a plurality of gaming facilities. When constructed in a single gaming facility, the game system  350  may be constructed in each floor or section of the gaming facility. The communication line  301  may be wires or wireless, and is constructed by a dedicated line, a switched line, or the like. 
     As shown in  FIG. 20 , the game system is roughly divided into a management server block, a customer terminal block, and a staff terminal block. The management server block includes a casino hall server  850 , an currency exchange server  860 , a casino/hotel staff management server  870 , and a download server  880 . 
     The casino hall server  850  is a server for managing the entire casino hall where the slot machines  10  are provided. The currency exchange server  860  is a server for generating exchange rate data based on currency exchange information or the like. The casino/hotel staff management server  870  is a server for managing the staff members of the casino hall or a hotel related to the casino hall. The download server  880  is a server for, for example, downloading latest information such as game-related information and news and forwarding the information to players via the PTS terminal  700  of each slot machine  10 . 
     The management server block includes a member management server  810 , an IC card &amp; money management server  820 , a megabucks server  830 , and an image server  840 . 
     The member management server  810  is a server for managing member information or the like of the players of the slot machines  10 . The IC card &amp; money management server  820  is a server for managing IC cards used in the slot machines  10 . More specifically, the IC card &amp; money management server  820  is a server that stores fractional money data in association with an identification code and outputs the fractional money data to the PTS terminal  700 . Furthermore, the IC card &amp; money management server  820  generates and manages denomination rate data or the like. The megabucks server  830  is a server for, for example, managing Mega bucks which is a game in which the sum total of amounts bet on a plurality of slot machines  10  in a plurality of casino halls is dealt with as a payout. The image server  840  is, for example, a server that downloads latest images such as game-related images and news images and forwards the images to the player via the PTS terminal  700  of each slot machine  10  and present it to the player. 
     The customer terminal block includes the slot machine  10 , a PTS terminal  700 , and a settlement machine  750 . The PTS terminal  700  is attachable to the slot machine  10  and capable of mutually communicating with the management server  800 . The settlement machine  750  exchanges money data stored in a player&#39;s IC card to real money and stores coins and bills in an IC card as cash data. 
     The staff terminal block includes a staff person management terminal  900  and a member card issuance terminal  950 . The staff person management terminal  900  is a terminal by which the staff of the casino hall manages the slot machines  10 . In particular, in the present embodiment, the staff of the casino hall checks if the number of IC cards in the PTS terminal  700  is too large or too small. The member card issuance terminal  950  is for a player who plays games at the casino hall to obtain a member card. 
     (PTS Terminal  700 ) 
     The PTS terminal  700  is incorporated in a PTS system, as shown in  FIG. 21 . The PTS terminal  700  attached to the slot machine  10  is arranged to be able to communicate with the game controller  100  of the slot machine  10  and the bill validation controller  890 . 
     The PTS terminal  700  conducts sound and image effects in games and updates the credit data, based on the communications with the game controller  100 . Furthermore, the PTS terminal  700  sends credit data to the bill validation controller  890 , which is required at the time of the settlement. 
     In addition to the above, the PTS terminal  700  is connected to the management server  800  to be able to communicate therewith. The PTS terminal  700  and the management server  800  are connected with each other by two lines, namely, a normal communication line and an additional function communication line. 
     The PTS terminal  700  exchanges, by the normal communication line, data such as cash data, identification code data, member information of a player. On the other hand, by the additional function communication line, the PTS terminal  700  conducts communications concerning newly-added functions. 
     In the present embodiment, the PTS terminal  700  conducts, by the additional function communication line, communications concerning an exchange function, an IC card function, a biometric identification function, a camera function, and an RFID (Radio Frequency Identification) function of individual identification by radio waves. 
     (Mechanical Structure of Slot machine) 
     Referring to  FIG. 8 , the overall structure of the slot machine  10  will be described. 
     A coin, a bill, or electrically valuable information corresponding to these is used as a game medium in the slot machine  10 . In the present embodiment, in particular, credit-related data such as cash data stored in an IC card is used. 
     The slot machine  10  includes a cabinet  11 , a top box  12  installed on the upper side of the cabinet  11 , and a main door  13  provided at the front surface of the cabinet  11 . 
     On the main door  13 , a symbol display device termed lower image display panel  141  is provided. The symbol display device is formed by a transparent liquid crystal panel. The screen displayed on the lower image display panel  141  has a symbol display region  150  at the central portion. The symbol display region  150  is constituted by 15 display blocks  28  forming a matrix of 5 columns and 3 rows. The three display blocks  28  of each column form pseudo reels  151  to  155 . On each of the pseudo reels  151  to  155 , three display blocks  28  move downward with changes in speed, so that the symbols  501  on the display blocks  28  are vertically rotated (variably displayed) and then stopped, in other words, the symbols are rearranged. The details of the display screen on the lower image display panel  141  will be given later. 
     While the present embodiment the slot machines  10  are so-called video slot machines, some or all mechanical reels in the slot machines  10  of the present invention may be replaced by the pseudo reels  151  to  155 . 
     On the front surface of the symbol display device is provided a touch panel  69 . The touch panel  69  allows a player to input various instructions by touching the display screen of the lower image display panel  141 . The input signal is transmitted from the touch panel  69  to the main CPU  71 . 
     Below the lower image display panel  141  is provided a control panel  30 . The control panel  30  is provided with buttons, a coin entry  21  for inserting coins into the cabinet  11 , and a bill entry  22 . The control panel  30  has a take-win/collect button  32 , the reserve button  45 , and the game rule button  33  ([GAME RULES] button) on the left side area of its upper stage, and a 1-bet button  34 , a 2-bet button  35 , a 3-bet button  36 , a 5-bet button  37 , a 10-bet button  38  on the left side area of its central stage. Furthermore, on the control panel  30 , a play-1 credit button  40 , a play-5 credit button  41 , a play-15 credit button  42 , a play-30 credit button  43 , and a play-60 credit button  44  are provided in the lower stage of the left area. The control panel  30  has the gamble button  31  and the spin button  46  in the lower right side area. Although illustration is not provided, these buttons  31  to  38 ,  40  to  46  each have therein an LED in such a manner that the ON/OFF state of the LED is controllable. The control panel  30  is detailed later. 
     On the lower front surface of the main door  13 , i.e., below the control panel  30 , a belly glass  132  on which a character of the slot machine  10  or the like is depicted are provided. Between the lower image display panel  141  and the control panel  30 , the PTS terminal  700  is attached. In the PTS terminal  700 , devices having a microphone function, a camera function, a speaker function, a display function and the like form a single unit. More specifically, the PTS terminal  700  includes an LCD, a human body detection camera, a microphone, a bass reflex speaker, or the like. The human body detection camera makes it possible to detect the presence of a player by the camera function. The microphone is used for the player&#39;s participation in a game by voice and the authentication of a player by voice recognition. The speaker produces sound effects in games and outputs notification sound when an IC card is left inserted. Furthermore, the speaker outputs notification sound when an inserted IC card is not authenticated. 
     In addition to the above, the PTS terminal  700  is provided with an LED and a card slot. The LED emits light with plural colors to notify the remaining number of IC cards in a card stacker. The card slot has a mechanism of allowing IC cards to be inserted and ejected. The IC card has a display region. The IC card is completely inside the machine when the player is playing games, and is ejected to expose the display region at the time of the settlement. This allows the player to recognize the credit-related data such as updated cash data. Alternatively, the IC card may be arranged to expose the display region not to be completely inserted, even when the player is playing games. This allows the player to always recognize the update of the credits during games. 
     When it is confirmed by the human body detection camera that no player is present at the time of the settlement of the credits, the IC card is drawn into and stored in the card stacker. With this arrangement, for example, the IC card is not left inserted for a long time, even if the player left the machine without taking the IC card after recognizing that the remaining credits on the display region are small. 
     Further, as described above, the PTS terminal  700  is provided with the VFD  177 . As shown in  FIG. 9 , the VFD  177  has at its center the game status area  1620  which displays the status of the game. In the game status area  1620  is displayed the bonus state  1621 , the winning content  1622 , and obtained credit  1623  and the like. In addition to these, credits, total bet amount, denomination, lines, bet, win meter are displayed. 
     Further, the cabinet  11  has speakers  112  (output mechanism) which are symmetrically arranged on the left and the right. The slot machine  10  executes the effect by outputting images, sound, and light, by means of the speakers  112  and the effect mechanism  131 . 
     (Electrical Structure of Slot Machine) 
     Now, referring to  FIG. 10  the configuration of a circuit in the slot machine  10  will be described. 
     A gaming board  50  is provided with: a CPU  51 , a ROM  52 , and a boot ROM  53 , which are mutually connected by an internal bus; a card slot  55  corresponding to a memory card  54 ; and an IC socket  57  corresponding to a GAL (Generic Array Logic)  56 . 
     The memory card  54  includes a involatile memory, and stores a game program and a game system program. The game program includes a program related to game progression and a program for producing effects by images and sounds. The game program further includes a symbol determination program. The symbol determination program is a program for determining symbols to be rearranged on the display block  28 . 
     The game program further includes sets of data such as: normal game symbol table data indicating a normal game symbol table that shows the relationship of each symbol in each symbol array of the display block, a code number, and a random number; bonus game symbol table data indicating a bonus game symbol table that shows the relationship of each symbol of each symbol array of the display block, a code number, and a random number; symbol number determination table data indicating a symbol array determination table; code number determination table data indicating a code number determination table; wild symbol increase amount determination table data indicating a wild symbol increase amount determination table; trigger symbol increase number determination table data indicating a trigger symbol increase number determination table; odds data indicating the relationship between the types and the number of symbols rearranged on an active line and a payout amount. 
     Further, the card slot  55  is configured so that the memory card  54  can be inserted thereinto and removed therefrom, and is connected to a motherboard  70  by an IDE bus. The type and contents of the game to be played on the slot machine  10  can be changed by drawing out the memory card  54  from the card slot  53 S, writing another game program into the memory card  54 , and inserting the memory card  54  into the card slot  53 S. 
     The GAL  56  is a type of PLD (Programmable Logic Device) having a fixed OR array structure. The GAL  56  is provided with a plurality of input ports and output ports, and predetermined input into the input port causes output of the corresponding data from the output port. 
     Further, the IC socket  57  is configured so that the GAL  56  can be inserted thereinto and removed therefrom, and is connected to the motherboard  70  by a PCI bus. The contents of the game to be played on the slot machine  10  can be changed by replacing the memory card  54  with another memory card  54  having another program written therein or by rewriting the program written into the memory card  54  as another program. 
     The CPU  51 , the ROM  52  and the boot ROM  53  mutually connected by the internal bus are connected to the motherboard  70  by a PCI bus. The PCI bus enables a signal transmission between the motherboard  70  and the gaming board  50 , and power supply from the motherboard  70  to the gaming board  50 . 
     The ROM  52  stores an authentication program. The boot ROM  53  stores a pre-authentication program, a program (boot code) to be used by the CPU  51  for activating the preliminary authentication program, and the like. 
     The authentication program is a program (falsification check program) for authenticating the game program and the game system program. The preliminary authentication program is a program for authenticating the aforementioned authentication program. The authentication program and the preliminary authentication program are written along a procedure (authentication procedure) for proving that the program to be the subject has not been falsified. 
     The motherboard  70  is constituted by a commercial general-purpose mother board (printed circuit board on which basic components for personal computers are mounted) and is provided with a main CPU  71 , a ROM (Read Only Memory)  72 , a RAM (Random Access Memory)  73 , and a communication interface  82 . This motherboard  70  is equivalent to the game controller  100  of the present embodiment. 
     The ROM  72  includes a memory device such as a flash memory, and stores a program such as BIOS (Basic Input/Output System) to be executed by the main CPU  71 , and permanent data. When the BIOS is executed by the main CPU  71 , processing for initializing predetermined peripheral devices is conducted. Further, through the gaming board  50 , processing of loading the game program and the game system program stored in the memory card  54  is started. In the present invention, the ROM  72  may be or may not be rewritable. 
     The RAM  73  stores data used for the operation of the main CPU  71  and programs such as the symbol determination program. For example, when the processing of loading the aforementioned game program, game system program or authentication program is conducted, the RAM  73  can store the program. The RAM  73  is provided with working areas used for operations in execution of these programs. Examples of the areas include: an area that stores counters for the number of games, the bet amount, the payout amount, the credit amount and the like; and an area that stores symbols (code numbers) randomly determined. 
     The communication interface  82  is for communicating with the external controller  621  such as a server, through the communication line  301 . Further, the motherboard  70  is connected with a later-described door PCB (Printed Circuit Board)  90  and a main body PCB  110  by respective USBs. Further, the motherboard  70  is connected to the power supply unit  81 . Furthermore, the motherboard  70  is connected with the PTS terminal  700  by USB. 
     When the power is supplied from the power supply unit  81  to the motherboard  70 , the main CPU  71  of the motherboard  70  is activated, and then the power is supplied to the gaming board  50  through the PCI bus so as to activate the CPU  51 . 
     The door PCB  90  and the main body PCB  110  are connected with input devices such as a switch and a sensor, and peripheral devices the operations of which are controlled by the main CPU  71 . 
     The door PCB  90  is connected with a control panel  30 , a reverter  91 , a coin counter  92 C and a cold cathode tube  93 . 
     The control panel  30  is provided with a reserve switch  31 S, a gamble switch  32 S, a game rule switch  33 S, a 1-bet switch  34 S, a 2-bet switch  35 S, a 3-bet switch  36 S, a 5-bet switch  37 S, a 10-bet switch  38 S, a play-1 credit switch  40 S, a play-5 credit switch  41 S, a play-15 credit switch  42 S, a play-30 credit switch  43 S, a play-60 credit switch  44 S, an information switch  45 S, and a spin switch  46 S, which correspond to the above-described buttons. Each of the switches outputs a signal to the main CPU  71  upon detection of press of the button corresponding thereto by the player. 
     Inside the coin entry  39  are provided a reverter  91  and a coin counter  92 C. The reverter  91  verifies validates a coin inserted into the coin entry  39 , and discharges coins other than genuine coins through a coin outlet. The coin counter  92 C detects the received genuine coins and counts the number of the coins. 
     The reverter  91  operates based on a control signal output from the main CPU  71 , and distributes valid coins validated by the coin counter  92 C into a hopper  113  or a cash box. That is, coins are distributed into the hopper  113  when the hopper  113  is not filled with coins, while coins are distributed into the cash box when the hopper  113  is filled with coins. 
     The cold cathode tube  93  functions as a backlight installed on the rear face sides of the effect mechanism  131  and the lower image display panel  141 , and lights up based on a control signal output from the main CPU  71 . 
     The main body PCB  110  is connected with the effect mechanism  131 , the speakers  112 , the hopper  113 , a coin detector  113 S, the touch panel  69 , the bill entry  22 , a graphic board  130 , a key switch  173 S, and the data displayer  174 . The speakers  112  output BGM sound or the like in accordance with a control signal output from the main CPU  71 . 
     The hopper  113  operates based on a control signal output from the main CPU  71 , and pays out coins of the specified number of payouts from the coin outlet to an unillustrated coin tray. The coin detector  113 S outputs a signal to the main CPU  71  upon detection of coins paid out by the hopper  113 . 
     The touch panel  69  detects a position on the lower image display panel  141  touched by a finger or the like of the player, and outputs a signal corresponding to the detected position to the main CPU  71 . 
     The bill entry  22  authenticates the bills and receives genuine bills into the cabinet  11 . The bills received by the cabinet  11  are converted onto the number of coins, and the credits equivalent to the converted coins are added as the credits owned by the player. 
     The graphic board  130  controls display of images conducted by the effect mechanism  131  and lower image display panel  141 , based on a control signal output from the main CPU  71 . The graphic board  130  is provided with the VDP (Video Display Processor) generating image data, the video RAM storing the image data generated by the VDP, and the like. It is to be noted that the image data used in generation of image data by the VDP is included in the game program that has been read from the memory card  54  and stored into the RAM  73 . 
     The key switch  173 S is provided in the keypad  173 , and outputs a predetermined signal to the main CPU  71  when the keypad  173  has been operated by the player. The data displayer  174  displays data read by the card reader  172  and data inputted by the player through the keypad  173 , based on a control signal outputted from the main CPU  71 . 
     (Symbols, Combinations, or the Like) 
     The symbols  501  displayed on the pseudo reels  151  to  155  of the slot machine  10  form a symbol array  170  in which a plurality of the normal symbols  502 , specific symbols  503 , the trigger symbols  504 , and the wild symbols  505  are arranged. Specifically, the pseudo reels  151  to  155  are configured so that symbol arrays  170   a ,  170   b ,  170   c ,  170   d ,  170   e  shown in  FIG. 4  to  FIG. 13  are scroll displayed thereon. The probability of having each symbol  501  rearranged is the same. Therefore, the probabilities of rearrangement are set by the number of symbols for each type in the symbol arrays  170 . 
     The way of setting the probabilities of rearrangement of symbols  501  is not limited to the above, and the probabilities of rearrangement may be set for each symbol. For example, a symbol random determination table may be used for determining symbols  501  used as the rearrangement target in the normal game. In the symbol random determination table, the normal symbol  501  for each of the display blocks  28  in each symbol array are associated with a code No. A range of random numbers are divided by the number of symbols in each symbol array to make a plurality of number ranges, the code No. is associated with a number range out of the number ranges. It should be noted that the above numbers may be divided into ranges equally, or in equally. For example, in the latter case, it is possible to adjust the probability of winning by a random number, based on the type of the symbol  501 . It is possible to adopt a plurality of symbol random determination tables, according to the gaming status. For example, a different symbol random determination tables may be used for the normal game and the free game, respectively. 
     The normal symbols  502  include six types: “9”, “10”, “JACK”, “QUEEN”, “KING”, and “ACE”. Further, as the specific symbols  503   a , there are a bat symbol  503   e , a gourd symbol  503   d , a fish symbol  503   c , a pot symbol  503   b , and a dragon symbol  503   a , as described hereinabove. Further, the wild symbols  505  include two types: normal wild symbols  505   a  and a double wild symbols  505   b . The wild symbol  505  triggers the random determination of the bonus game, and could serve as a substitute for the normal symbol  502 , the specific symbol  503 , and the trigger symbol  504 . It should be noted that when the double wild symbol  505   b  is rearranged, the payout and the probability of the bonus game is doubled. Note further that the normal wild symbols  505   a  only exist in the symbol array  170   b  and the symbol array  170   d  of the pseudo reel  152  and the pseudo reel  154 . The double wild symbol  505   b  is only in the symbol array  170   c  of the pseudo reel  153 . Each of the trigger symbols  504  is a symbol which triggers a free game. 
     As shown in  FIG. 24 , three successive symbols  501  in a symbol array are displayed (arranged) in the upper stage, the central stage, and the lower stage of the display area of the pseudo reels  151  to  155  thereby forming a symbol matrix of five columns and three rows, in the symbol display region  150 . The symbols  501  forming the symbol matrix are start being scrolled when at least the spin button  46  is pressed and the game is started. After a predetermined period from the start of scrolling, scrolling of the symbols  501  stops (rearrangement). 
     Further, for each of the symbols  501 , various winning combinations are determined in advance. Note that the winning combination means that a prize is established. The winning combination is a combination of the symbols  501  stopped on an activated line, which brings about an advantageous state to the player. For example, the advantageous state is a state in which coins are paid out according to the winning combination, a state in which the number of coins paid out is added to the number of credits, and a state in which a bonus game is started. 
     The winning combinations in the present embodiment include a winning combination which generates the scatter win, a winning combination which generates the line win. Specifically, the scatter win is attributed to the trigger symbol  504  which triggers running of the free game, and triggers execution of the random determination for the bonus game. When one or more trigger symbols  504  are rearranged in the symbol display region  150 , a payout is awarded according to the number of the trigger symbols  504  rearranged. 
     Further, the line win is attributed to the normal symbols  502 , the specific symbols  503 , and the wild symbols  505 . In the present embodiment, there are no paylines, and all the possible patterns (243 patterns) on the pseudo reel  151  to pseudo reel  155  are the paylines. That is, the line win is established if the pseudo reels  151  to  155  each has the same symbol  501  in its upper stage, middle stage, or lower stage in the symbol display region  150 . In an example shown in  FIG. 24 , the bat symbol  503   e  is rearranged in each of the pseudo reels  152  to  154 , thus forming a three of a kind combination of the bat symbol  503   e . It should be however noted that a payline for establishment of a line win may be set. 
     The symbols  501  to be rearranged in the normal game are randomly determined upon pressing down the spin button  46 . The symbols  501  to be rearranged in the free game are randomly determined immediately before variable displaying of the pseudo reels  151  to  155  is started. Further, whether to run the bonus game is randomly determined when the wild symbol  505  is rearranged in the symbol display region  150 . Further, in the bonus game, the bonus type is randomly determined when the effect image (an animation of a frog spitting out a coin) provided upon rearrangement of the wild symbol  505  in the symbol display region  150  is switched to a bonus game screen. Further, random determination for a mystery bonus is executed at a time point of starting variable displaying of pseudo reels  151  to  155 . 
     (Display Screen: Payout Table) 
     As shown in  FIG. 25 , on the upper image display panel  142  is displayed a payout table of winnings shown in  FIG. 3 . Specifically, on the upper image display panel  142 , a first payout table  1431  is displayed on the left end portion, a second payout table  1432  is displayed in the right end portion, and a jackpot amount  1433  and a jackpot name  1434  are displayed in the middle portion. The first payout table  1431  and the second payout table  1432  each indicates the obtainable credit amount at the payout rate of ×1 from each winning combination. In the first payout table  1431  are indicated payouts for the dragon symbol  503   a  and the pot symbol  503   b . The payouts for winning combinations of the dragon symbol  503   a  are: 58 credits for a 3 of the kind, 188 credits for a 4 of the kind, and 688 credits for a 5 of the kind. The payouts for winning combinations of the pot symbol  503   b  are: 25 credits for a 3 of the kind, 60 credits for a 4 of the kind, and 300 credits for a 5 of the kind. 
     The first payout table  1431  further indicates explanations for the wild symbols  505 . Specifically, regarding the double wild symbol  505   b , the first payout table  1431  indicates that the double wild symbol  505   b  can replace any symbol except the wild symbol  505 ; that the payout becomes a double when a winning combination includes the double wild symbol  505   b ; and that the double wild symbol  505   b  could only appear in the third reel (pseudo reel  153 ). Further, regarding the normal wild symbol  505   a , the first payout table  1431  indicates that the normal wild symbol wild symbol  505   a  can replace any symbol except the wild symbol  505 ; and that the normal wild symbol  505   a  could only appear in the second reel and the fourth reel (pseudo reels  152  and  154 ). 
     In the second payout table are indicated payouts for the trigger symbol  504 , the fish symbol  503   c , the gourd symbol  503   d , and the bat symbol  503   e . The payouts for the trigger symbols  504  of a scattering type are: 3 credits for a 3 of the kind, 8 credits for a 4 of the kind, and 58 credits for a 5 of the kind. The payouts for winning combinations of the fish symbol  503   c  are: 20 credits for a 3 of the kind, 45 credits for a 4 of the kind, and 125 credits for a 5 of the kind. The payouts for winning combinations of the gourd symbol  503   d  are: 15 credits for a 3 of the kind, 30 credits for a 4 of the kind, and 100 credits for a 5 of the kind. The payouts for winning combinations of the bat symbol  503   e  are: 10 credits for a 3 of the kind, 15 credits for a 4 of the kind, and 60 credits for a 5 of the kind. 
     The jackpot amount  1433  indicates payout amounts for four types of bonuses, and a jackpot name  1434  (GRAND, MAJOR, MINOR, MINI) indicating the name of the bonus type is associated. The displayed content of the jackpot amount  1433  is variable according to the conditions. It should be noted that, in the lower image display panel  141  and the upper image display panel  142 , number fonts of different widths are used according to the number of digits of the value displayed. 
     (Free Game) 
     Next, the following will describe the free game. The initial count of free games is 10. As shown in  FIG. 26 , the free game is run, when a predetermined number (e.g., 3) or more trigger symbols  504  are rearranged. In the free game, symbol arrays  170  (see  FIG. 9  to  FIG. 13 ) different from those used in the normal game are used. When a predetermined number (e.g., 3) or more of trigger symbols  504  are rearranged, a retrigger which adds 10 to the remaining count of free games occurs. The number of times the retrigger occurs is not limited in the present embodiment; however, the present invention is not limited to this. 
     When a predetermined number or more of trigger symbols  504  are rearranged, the lower image display panel  141  displays “10 FREE GAMES”. After darkening, the symbol arrays  170  of the pseudo reels  151  to  155  are changed to those for free games corresponding to the bet amount placed in the immediately previous normal game. Further, as shown in  FIG. 27 , in the lower right part of the lower image display panel  141  is displayed a free game counter  183 . The free game counter  183  displays the total number of the free games and a counted number. For example, when the free game counter  183  displays “2 OF 10”, it means that the free game is executed ten times, and currently the free game has counted up to two. That is, the counter is capable of informing the player that the free games are progressing one game at a time. It should be noted that the count value before the start of free games is 0, and the count value is incremented by 1, upon starting of the variable displaying of the pseudo reels  151  to  155 . The incremented count value is enlarged as a visual effect, at the same time as an audio effect. Further, the free game counter  183  indicates that the game is played with the bonus reels, and the free games are being played. Then, variable displaying of the symbol array  170  in the symbol display region  150  is automatically started. When a winning occurs in the free game, a later-described win screen is displayed. 
     When the remaining number of free games are consumed and the free games are all ended, the lower image display panel  141  displays the total credit, and then the process returns to the normal game. Further, when a predetermined number or more of trigger symbols  504  are rearranged, the value of the free game counter  183  is incremented by 10, after an effect by a sound “jilililili . . . ” (bell ring like sound), as hereinabove mentioned. For example, the free game counter  183  changes its indication from “3 of 10” to “3 of 20”. Further, with establishment of trigger symbols  504 , the later-described win-effect is executed. 
     When no winning occurs in a free game, there will be a standby period of 2 seconds, between the completion of rearrangement on the pseudo reels  151  to  155  and the start of variable displaying in the following free game. It should be noted that the standby period may be skippable by the spin button  46  and the like. It should be noted that in the present embodiment, skipping of reel spinning by the spin button  46  and the like is disabled. 
     It should be noted that in the free game, a selection game for increasing the number of specific symbols  503  may be run. As shown in  FIG. 28 , when the free game is started, a selection game screen is first displayed on the lower image display panel  141 . In the selection game screen, five selectable images  184  are arrayed at the lower part of the lower image display panel  141 . Further, a message  185  prompting selection of one of the selectable images  184  is displayed in the middle of the lower image display panel  141 . When a control panel  30  is used to make selection out of the selectable images  184 , the selected selectable image  184  is changed to a selected symbol image  187 . The selected symbol image  187  is any one of the five types of specific symbols  503 . Further, the non-selected selectable images  184  (four symbols) are changed to non-selected symbol images  186 . The four non-selected symbol images  186  are the remaining four out of the five types of specific symbols  503 , other than the type indicated by the selected symbol image  187 . 
     Only the specific symbol  503  indicated by the selected symbol image  187  selected in the selection game screen as described above could be displayed in the symbol arrays  170  of the free game. That is, the symbol arrays  170  of the free game could display one type of specific symbol  503  selected in the selection game, the normal symbols  502 , the trigger symbols  504 , and the wild symbols  505 . Accordingly, the four types of specific symbols  503  not selected in the selection game are not displayed in the free game. Further, the number of the type of specific symbols  503  that is selected in the selection game and that could be displayed on the symbol arrays  170  in the free game varies according to the value of symbol bet in the normal game having triggered the free game. That is, the percentage of selected type of specific symbols arranged in the symbol arrays increases with an increase in the value of the symbol bet. 
     Exemplary symbol arrays of the free game in which the above described selection game has been run are shown in  FIG. 57  to  FIG. 60 .  FIG. 57  and  FIG. 58  shows an example where the specific symbol of “PHOENIX” is selected in the selection game.  FIG. 57  shows the symbol arrays when the value of symbol bet is 1 in the normal game having triggered the free game.  FIG. 58  shows the symbol arrays when the value of symbol bet is 60 in the normal game having triggered the free game.  FIG. 59  and FIG.  60  show an example where the specific symbol of “SWALLOW” is selected in the selection game.  FIG. 59  shows the symbol arrays when the value of symbol bet is 1 in the normal game having triggered the free game.  FIG. 60  shows the symbol arrays when the value of symbol bet is 60 in the normal game having triggered the free game. 
     As shown in  FIG. 57  to  FIG. 58 , it is only the “PHOENIX” selected in the selection game which is displayed as the specific symbol  503 . Further, the number of the specific symbols of “PHOENIX” in the symbol arrays increases with an increase in the value of the symbol bet. Further, the number of symbols in the symbol arrays are reduced, raising the percentage of the specific symbol of “PHOENIX”. As shown in  FIG. 59  to  FIG. 60 , it is only the “SWALLOW” selected in the selection game which is displayed as the specific symbol  503 . Further, the number of the specific symbols of “SWALLOW” in the symbol arrays increases with an increase in the value of the symbol bet. Further, the number of symbols in the symbol arrays are reduced, raising the percentage of the specific symbol of “SWALLOW”. As should be understood, only the type of the specific symbol selected in the selection game is displayed in the symbol arrays of the free game, and the percentage of that type of the specific symbol increases with an increase in the value of the symbol bet in the normal game having triggered the free game. Therefore, for each type of (5 types of) the specific symbols, five sets of symbol arrays for each symbol bet (25 sets altogether) are prepared in advance. 
     (Bonus Game) 
     When one or more wild symbols  505  are rearranged in any of the pseudo reels  151  to  155  in the normal game and the free game, the random determination (first random determination) of whether to run the bonus game is executed. When the bonus game is run in the middle of the free game, the free game is interrupted and the bonus game as shown in  FIG. 2  is started. Further, in each normal game, the random determination for the mystery bonus (second random determination) is executed, and the bonus game is run when the random determination results in a wining. That is, when the both first random determination and the second random determination result in a winning in a normal game, the bonus game will be run twice. The first random determination and the second random determination are described later. 
     As shown in  FIG. 2 , there are 14 selectable images  1421  in the bonus game. The selectable images  1421  include two double bonus rank images  1422   e . When a double bonus rank image  1422   e  is displayed, a message reading “Lucky! You won a double!” is displayed below the double bonus rank image  1422   e , and the count value of the corresponding rank count region  1423  is incremented by 2. 
     When running of the bonus game is determined, random determination for determining the mode of effect, i.e., the first mode (scenario mode) or the second mode (random mode) is executed. The weighting for both effect modes is 1 and therefore the probability of each effect mode being selected is ½ in the present embodiment; however, the present invention is not limited to this. In the scenario mode, there is a predetermined sequence of displaying the bonus rank images  1422  up to a certain number of times, and the bonus rank images  1422  are displayed according to the predetermined sequence. After that, the bonus rank images  1422  to be displayed and the sequence of displaying the bonus rank images  1422  are determined based on the bonus determined in advance. In the random mode, the bonus rank images  1422  and the sequence of displaying the bonus rank images  1422  are determined entirely based on the bonus determined in advance. Namely, the bonus rank images  1422  corresponding to the bonus determined in advance is set to occur four times, and the last bonus rank image  1422  corresponding to the bonus is set to occur at the end. This way, the effect display is performed until the bonus rank image  1422  corresponding to the bonus determined in advance occurs four times. The second mode allows selection of the selectable images  1421  from the minimum of 3 times to the maximum of 10 times. 
     The scenario mode is further detailed below. In the scenario mode, one of a plurality of scenarios is selected. Each scenario determines the bonus rank images  1422  to be displayed by selection of the selectable images  1421 , from the first pick to the fourth pick, as shown in the scenario table in  FIG. 30 . There are 24 types of scenarios, and each scenario is weighted 1. However, the scenarios may be weighted differently. It should be noted that in all the scenarios, only the bonus rank images  1422  corresponding to high rank bonus types are set. Therefore, in the scenario mode, the bonus rank images  1422  displayed are always those corresponding to a high rank bonus type, up to fourth selection. In a single bonus game, a single scenario is randomly determined. For example, when a scenario 1 is selected in a bonus game, a double bonus rank image  1422   e  for a Grand rank bonus is displayed for the first time, no matter which one of the selectable images  1421  the player picks, as shown in  FIG. 31 . Then, there will be counting of two in the count images  1423   a  for the Grand rank in the rank count region  1423 . Then, as shown in  FIG. 32 , the Grand rank image  1422   a  is displayed for the second time, no matter which one of the selectable images  1421  the player picks. Then, the count is further incremented by 1 up to 3 in the count images  1423   a  for the Grand rank in the rank count region  1423 . 
     As shown in  FIG. 33 , the double bonus rank image  1422   f  for the Major rank is displayed for the third time, and the Major rank is counted up by 2. In the fourth time, a Major rank image  1422   b  is displayed again, and the Major rank is further counted up. In the fifth time pick and thereafter, the bonus rank image  1422  for the bonus type determined in advance is displayed. It should be noted that, the bonus to be won is determined in advance, and the bonus rank images  1422  to be displayed in the fifth time pick and thereafter are determined so that the counts of the bonus rank images  1422  for the other bonus types never reaches 4. The bonus rank images  1422  for the fifth time pick and thereafter are displayed, in response to an operation of the control panel  30  by the player. 
     When the value of any count reaches 4 in the rank count region  1423 , a frame image  1423   b  is displayed as shown in  FIG. 34 , surrounding the rank count region  1423  of the bonus determined. This way, the type of bonus won is clearly displayed. Then, as shown in  FIG. 35 , a result display screen is displayed on the lower image display panel  141  as shown in  FIG. 35 . The result display screen shows a bonus result  1450  indicative of the type of bonus determined, and the amount of credit won. Then, the process returns to the state where the bonus game is triggered. 
     (Random Determination Related to Bonus Game) 
     The following describes random determination related to the bonus game. As described above, in the bonus game, one bonus type out of four bonus types (Grand Bonus, Major Bonus, Minor Bonus, Mini Bonus) is determined. The initial values of the Grand Bonus, the Major Bonus, the Minor Bonus, and the Mini Bonus are 500000 credits, 40000 credits, 4000 credits, and 2000 credits, respectively. The bonus value is the product of the above initial value multiplied by an amount of money pre-set as a denomination. Further, the default increment rates of the bonus values are as follows. Namely, the default increment rates of the Grand Bonus, the Major Bonus, the Minor Bonus, and the Mini Bonus are 0.1%, 0.1%, 0.5%, and 1%, respectively. 
     The following describes the random determination (also referred to as first random determination or progressive challenge) of whether to run the bonus game, which is executed when the wild symbol  505  is rearranged in the normal game or the free game. The probability of winning the bonus game in the progressive challenge is increased according to the type of symbol bet and the number of wild symbols  505  rearranged. Specifically, as shown in  FIG. 36 , in a progressive challenge table, a numerical value is associated with each symbol bet for each variation of the game. This progressive challenge table is given for each setting combination. To improve the accuracy, the numerical value is multiplied by 1000000, and the resulting product is used as the denominator for the probability of winning. Further, in the normal game or the free game having triggered the progressive challenge, the number of normal wild symbols rearranged is multiplied by 1000000, and the resulting product is used as the numerator for the probability of winning. It should be noted the double wild symbol  505   b  is calculated as two wild symbols. 
     For example, when the value in the progressive challenge table is 216.822430, this value is multiplied by 1000000, and the denominator is 216822430. Further, when the number of wild symbols  505  is 1, the value of 1 is multiplied by 1000000, and the numerator is 1000000. In the progressive challenge, a random number is extracted to determine whether or not the result is a winning. Specifically, as shown in  FIG. 37 , winning ranges and losing ranges are designated within the range of random numbers from 0 to 216822429. In the example of  FIG. 37 , the ranges of 0 to 9999, 1010000 to 216822429 are set as the ranges of losing, and a range of 10000 to 1009999 is set as the range of winning. The winning range is expanded when, for example, the number of wild symbols  505  is two or more. A random number ranging from 0 to 216822429 is extracted, and the winning or losing is determined by the range in which the extracted number falls within. 
     Next, the following describes the random determination (also referred to as second random determination, mystery random determination) which is executed in every normal game. The probability of winning the bonus game in the mystery random determination is determined based on the bet amount and the mystery random determination table shown in  FIG. 38 . The mystery random determination table is commonly used for any variation of the game. In the mystery random determination table, a numerical value is associated with each setting combination, and that numerical value serves as the denominator. The numerator is the bet amount in the normal game, and the winning or losing is determined based on the numerical ranges shown in  FIG. 37 . 
     When the bonus game is determined as to be run as the result of progressive challenge and the mystery random determination, which one of the four types of bonuses will be awarded as the payout is randomly determined (this process is also referred to as progressive random determination). Specifically, as shown in  FIG. 39 , the weighting value of each bonus type is determined in advance in a progressive random determination table. That is, the probability of winning of each bonus type is a value deriving from a fractional expression where the total of weighting values is the denominator and the weighting value of each bonus type is the numerator. It should be noted that the Minor Bonus is set as the default in case of an abnormality. 
     (Operations of Slot Machine  10 : Normal Game Running Process) 
     The operation of the slot machine  10  arranged as above will be described. The normal game running process shown in  FIG. 40  is executed by the main CPU  71  of the slot machine  10 . The slot machine  10  has been activated in advance. 
     To begin with, the main CPU  71  executes a credit request process (S 10 ). In this process, the player determines how many credits are used from the credits stored in the IC card. 
     Then whether a coin is bet is determined (S 11 ). In this process, the main CPU  71  determines whether an input signal output from the 1-BET switch  34 S when the 1-BET button  34  is pressed and an input signal output from the 10-BET switch  39 S when the 10-BET button  38  is pressed are received. When it is determined that no coin is bet, the process goes back to S 10 . 
     In the meanwhile, if it is determined in S 11  that a coin is bet, the main CPU  71  executes a process of decreasing the credit amount stored in the RAM  73  in accordance with the number of coins bet (S 12 ). When the number of coins bet is larger than the number of credits stored in the RAM  73 , the step of decreasing the credit amount stored in the RAM  73  is not carried out and the process goes back to S 11 . When the number of coins bet is larger than the maximum number of coins on one game, the step of decreasing the credit amount stored in the RAM  73  is not carried out and the process proceeds to S 13 . 
     Then the main CPU  71  determines whether the spin button  46  is pressed (S 13 ). In this step, the main CPU  71  determines whether an input signal output from the spin switch  46 S when the spin button  46  is pressed is received. When it is determined that the spin button  46  is not pressed, the process goes back to S 11 . It is noted that, when the spin button  46  is not pressed (e.g., when an instruction to end a game is input while the spin button  46  is not pressed), the main CPU  71  cancels the reduction result in S 12 . 
     In the meanwhile, if it is determined in S 13  that the spin button  46  is pressed, the main CPU  71  executes the mystery random determination, and determines whether to run the bonus game by the mystery bonus (S 14 ). When the mystery random determination results in a winning, the result is stored in the storage device, e.g., turning on the flag of the mystery bonus. Then, the normal game symbol determination process is executed (S 15 ). In the normal game symbol determination process, code numbers when the symbols are stopped are determined Specifically, the code No. of each display block  28 , at the time of stopping the symbol arrays is determined based on the random number obtained. 
     Thereafter, in S 16 , the main CPU  71  executes a scroll display control process. In this process, the display control is conducted so that, after the start of the scroll of the symbols  501 , the symbols  501  are rearranged in accordance with S 15 . 
     Next, the main CPU  71  in step S 14  determines whether or not the mystery bonus has been won (S 17 ). If the mystery bonus is won, the bonus game is run (S 18 ). After the bonus game by the mystery bonus is run, or when the mystery bonus was not won, whether or not a winning is established is determined with the rearrangement of symbols determined in step S 15  (S 17 ). In S 17 , the main CPU  71  counts, regarding the symbols  501  rearranged in accordance with S 16 , the number of symbols  501  of each type rearranged on each active line, and whether or not the rearrangement of symbols falls within any type of winning is determined. 
     When it is determined that a prize is established, the main CPU  71  executes a step concerning the payout of coins (S 20 ). In this step, the main CPU  71  determines a payout rate with reference to odds data stored in the RAM  73  and based on the number of symbols  501  rearranged on an active line. The odds data indicates the relationship between the number of symbols  501  rearranged on an active line and a payout rate. It should be noted that the payout is doubled when a double wild symbol  505   b  is rearranged, and a winning related to this is established. 
     When a prize is not established in S 19 , or after the process of S 20 , the main CPU  71  determines whether or not the free game is triggered (S 21 ). When the free game is triggered, the free game is started (S 22 ). When the free game is not triggered, or after the free game is run, whether or not a wild symbol is rearranged is determined (S 23 ). When the wild symbol is rearranged, the random determination for the bonus game is executed according to the number of wild symbols, and whether or not the bonus game is won is determined (S 24 ). Then, if the bonus game is won, the bonus game is run (S 25 ). When the wild symbol is not rearranged, or after the bonus game triggered by the rearrangement of the wild symbol is run, the present routine is ended. 
     As described, the bonus game is triggered by the mystery random determination, and the progressive challenge executed by the rearrangement of the wild symbol also determines whether to trigger the bonus game. Therefore, there is a chance of obtaining the bonus game at one time in the mystery random determination and the progressive challenge. To change the probabilities of the progressive challenge dependent on the symbol arrays, it is necessary to modify the symbol arrays; however, since there is a bonus game by the mystery random determination, there is no need of changing the symbol arrays for changing the probabilities of random determination of the bonus game. In other words, by changing the probabilities of the mystery random determination, it is possible to change the probabilities of random determinations for the bonus game without a need of changing the arrangement of the symbols in the symbol arrays. 
     (Operations of Slot Machine: Free Game Running Process) 
     As shown in  FIG. 41 , in the free game running process, 10 times of free games are first set. That is, the predetermined number of games=10 (S 31 ). The reel bands are switched to those for the free game(S 32 ). That is, the type of symbol bet in the normal game triggered the free game is determined, and the symbol arrays for the free game according to the type of symbol bet is selected. 
     Subsequently, whether the spin button  46  is pressed to be turned on is determined (S 34 ). When the spin button  46  is not pressed (S 34 : NO), S 34  is executed again. In the meanwhile, when the spin button  46  is pressed (S 34 : YES), after a free game symbol determination process is executed (S 35 ), a scroll display control process is executed (S 36 ). Then whether the re-trigger condition (free game addition condition) is established is determined (S 37 ). When a prize is established (S 37 : YES), S 39  is executed after the payout process (S 38 ). In the meanwhile, when a prize is not established (S 37 : NO), S 39  is executed. 
     In S 39 , whether the retrigger condition (free game addition condition) is established is determined (S 39 ). When the retrigger condition is not established (S 39 : NO), 1 is subtracted from a predetermined number of times of execution of the game (S 41 ). On the other hand, when the retrigger condition is established (S 39 : YES), 10 free games are added (S 40 ). 
     When the free game is not triggered, or after the 10 free games are added, whether or not a wild symbol is rearranged is determined (S 41 ). When the wild symbol is rearranged, the random determination for the bonus game is executed according to the number of wild symbols, and whether or not the bonus game is won is determined (S 42 ). Then, if the bonus game is won, the bonus game is run (S 43 ). In step S 41 , if the wild symbol is determined as not to be rearranged, or after the bonus game running process in step S 43 , 1 is subtracted from the predetermined number of games (S 44 ). 
     Then whether the predetermined number of times of execution of the game is 0 is determined (S 45 ). When the predetermined number of times of execution of the game is not 0 (S 45 : NO), it is determined that the free game is being executed, and the process is executed again from S 34 . On the other hand, when the predetermined number of times of execution of the game is 0 (S 45 : YES), it is determined that the feature game is finished, and the present routine is terminated. 
     (Operations of Slot Machine: Bonus Game Running Process) 
     As shown in  FIG. 42 , the bonus random determination (S 61 ) is first executed in the bonus game running process, and the bonus to be awarded is determined. Then, the mode random determination is executed (S 62 ). In the mode random determination, the scenario mode or the random mode is selected. Next, whether the mode determined in step S 62  is the scenario mode is determined (S 63 ). When the mode is the scenario mode (S 63 : YES), scenario random determination for selecting the scenario is executed (S 64 ). Then, the bonus rank images to be displayed after the scenario selected are determined (S 65 ). On the other hand, when the mode selected is not the scenario mode (S 63 : NO), the bonus rank image  1422  is randomly determined for each pick (first pick to 1fourth pick) (S 66 ). In step S 65  and S 66 , 14 bonus rank images  1422  (two Grand Rank images  1422   a , two Major Rank images  1422   b,  4 Minor Rank images  1422   c,  4 Mini Rank images  1422   d,  1 double bonus rank image  1422   e  of Grand Rank, 1 double bonus rank image  1422   f  of Major Rank) which could be displayed are associated with the first pick to the 1fourth pick. In step S 65 , the images are determined for the fifth pick and the picks thereafter, which exclude the first to pick and fourth pick for which the images are already determined by the scenario. It should be noted that the 14 bonus rank images  1422  are associated so that the image for the bonus rank determined in step S 61  will be counted 4 before the other bonus ranks. Therefore, the actual number of picks by the player will be eleventh pick at the most. 
     In step S 65  or after step S 66 , 14 selectable images  1421  are displayed, and the input of the player selection is waited (S 67 ). There is determined whether or not a selection of the selectable image  1421  is input via the control panel  30  (S 68 ). If there is no input, the step S 68  is repeated. If there is an input, the selectable image  1421  picked is changed to the bonus rank image  1422  determined in step S 65  or step S 66  (S 69 ). Then, a count image  1423   a  corresponding to the bonus rank image  1422  is displayed in the rank count region  1423  (S 70 ). When the bonus rank image  1422  is the double bonus rank image  1422   e , two count images  1423   a  are displayed. After that, there is determined if there is any bonus rank for which four count images  1423   a  have been displayed (S 71 ). If there is no bonus rank for which four count images have been displayed, step S 68  is repeated. 
     When all the bonus rank images  1422  are displayed, a bonus game result displaying process is executed (S 72 ). Specifically, a frame image  1423   b  is displayed for the rank count region  1423  corresponding to the bonus won, and a bonus result  1450  is displayed. Then, the present routine is terminated. 
     (Display Screen: Normal Game Screen) 
     As shown in  FIG. 24 , above the symbol display region  150 , a credit meter  400 , a bet meter  401 , a win meter  402 , and a status indicator  419 . The credit meter  400  and the bet meter  401  are displayed at the left end portion when viewed from the player. In the meanwhile, the win meter  402  is provided at the right end portion when viewed from the player. The status indicator  419  are provided in the middle portion. 
     The credit meter  400  displays the total amount of credits (remaining credit amount). The default value is 0. The value is increased and decreased as follows: When “take WIN”, which indicates winning in a game, is achieved, the credit won in the game is added to the credit meter. When a game is played, the bet number is subtracted from the credit meter. The bet number is also subtracted when the collect ends. The positions of displaying the system font of the credit meter  400  are as follows. That is, the credit meter (Definition: F_CREDIT) is in a position where the x-coordinate is 98.0 and the y-coordinate is 45.0. Further, the credit amount (Definition: F_CREDIT_MONEY) is indicated in a position where the x-coordinate is 98.5 and the y-coordinate is 75.0. The TOKENIZE (Definition: F_TOKENIZE) is in a position where the x-coordinate is 105.5 and the y-coordinate is 97.0. 
     The bet meter  401  displays “Total Bets”. When a bet is place for each of the activated lines, the total bet is a bet x the number of lines. The value is re-calculated in each game play. The positions of displaying the system font of the bet meter  401  are as follows. That is, the bet meter (Definition: F_WAGER) is in a position where the x-coordinate is 232.0 and the y-coordinate is 45.0. Further, the bet amount (Definition: F_WAGER_MONEY) is indicated in a position where the x-coordinate is 230.0 and the y-coordinate is 75.0. 
     The win meter  402  displays the total obtained credits in an increment manner. The default value is  0 . The positions of displaying the system font of the win meter  402  are as follows. That is, the win meter (Definition:F_WIN) is displayed in a position where the x-coordinate is 673.0 and the y-coordinate is 45.0. Further, the amount won (Definition: F_WIN_MONEY) is indicated in a position where the x-coordinate is 673.0 and the y-coordinate is 108.0. Each win (Definition: F_SYS_LINE_NO) is indicated in a position where the x-coordinate is 673.0 and the y-coordinate is 71.0. The total win (Definition: F_SYS_LINE_TOTAL_WIN) is indicated in a position where the x-coordinate is 673.0 and the y-coordinate is 86.0. 
     For example, the indication on the win meter  402  is as follows, when a simple 3 of a kind combination occurs, without appearance of a double wild symbol  505   b  and the like. Namely, when the gourd symbol  503   d  is rearranged, one each, on the pseudo reels  151  to  153 , there is an indication of “3 PICT_D=15”, and “TOTAL WIN=15” is indicated as the total amount. Further, a value resulting from a multiplication of this total amount by the denomination is indicated. 
     Further, the indication on the win meter  402  is as follows, when a simple 3 of a kind combination occurs, with appearance of a double wild symbol  505   b . Namely, when the gourd symbol  503   d  is rearranged, one each, on the pseudo reels  151  to  152  and the double wild symbol  505   b  is rearranged on the pseudo reel  153 , there is an indication of “3 PICT_D×2WILD=30”, and “TOTAL WIN=30” is indicated as the total amount. Further, a value resulting from a multiplication of this total amount by the denomination is indicated. 
     Further, the indication on the win meter  402  is as follows, when a 3 of a kind combination including the double wild symbol  505   b  and a simple 3 of a kind combination occur. Namely, when the fish symbol  503   c  is rearranged, one each, on the pseudo reels  151  to  153  and the double wild symbol  505   b  is rearranged on the pseudo reel  153 , there are indications of “3 PICT_C=30” and “3 PICT_C×2 WILD=40”, and “TOTAL WIN=60” is indicated as the total amount. Further, a value resulting from a multiplication of this total amount by the denomination is indicated. 
     Further, the indication on the win meter  402  is as follows, when a plurality of 3 of a kind combinations occur, with appearance of a double wild symbol  505   b . Namely, when a “10” symbol, one pot symbol  503   b , and one fish symbol  503   c  are rearranged on the pseudo reel  151 , a normal wild symbol  505   a  and two fish symbols  503   c  on the pseudo reel  152 , and the double wild symbol  505   b  on the pseudo reel  153 , there are alternated indications of “3 PICT_B×2 WILD=50”, “3 PICT_C×3×2 WILD=120”, and “3 TEN×2 WILD=10”, and “TOTAL WIN=180” is indicated as the total amount. Further, a value resulting from a multiplication of this total amount by the denomination is indicated. 
     Further, the indication on the win meter  402  is as follows, when a plurality of winning combinations higher than the 3 of a kind combination occur, with appearance of a double wild symbol  505   b . Namely, when one pot symbol  503   b  and one bat symbol  503   e  are rearranged on the pseudo reel  151 , one pot symbol  503   b  and two bat symbols  503   e  on the pseudo reel  152 , one bat symbol  503   e  and the double wild symbol  505   b  on the pseudo reel  153 , and one pot symbol  503   b  on the pseudo reel  154 , there are alternated indications of details reading “4 PICT_B×2 WILD=120”, “3 PICT_E×2=20”, and “3 PICT_E×2 WILD=40”, and “TOTAL WIN=180” is indicated as the total amount. Further, a value resulting from a multiplication of this total amount by the denomination is indicated. 
     The status indicator  419  indicates bet information of the current game, and the gaming status. The status indicator  419  has an area for indicating BET MULTIPLIER at the upper stage, and an area for indicating the gaming status at the lower stage. The bet information is the bet amount placed. For example, when the bet amount is 1, the indication will be “BET MULTIPLIER 1” and when the bet amount is 2, the indication will be “BET MULTIPLIER 2”. The gaming status is hidden while the game is running for example. When the game is over, there will be an indication reading “GAME OVER”, and while an input regarding whether to run a gamble game is waited, there will be an indication reading “PLAY ON, GAMBLE or TAKE WIN”. The positions for indicating system font of the status indicator  419  are as follows. Namely, Bet Per Line (Definition: F#SYS#BET) is in a position where the x-coordinate is 442.0 and the y-coordinate is 550.0; Play Line (Definition: F#SYS#LINE) is in a position where the x-coordinate is 442.0 and the y-coordinate is 564.0. 
     Specifically, immediately after the RAM is cleared, the bet information area of the status indicator  419  indicates “BET MULTIPLIER n” (where n is the set minimum value of the bet pattern). After pressing “BET×XX”, the indication will be “BET MULTIPLIER n” with the value of n changed for each pressing of the bet button. In other cases, the immediately preceding display content is kept displayed. 
     Further, immediately after the RAM is cleared, the gaming status area of the status indicator  419  indicates “GAME OVER”. Further, when the spin button  46  is pressed, the indication is hidden while the reels are scrolling, and the indication will be “GAME OVER” in the other occasions. When the state is WIN and GAMBLE is enabled, the indication will be “PLAY ON, GAMBLE or TAKE WIN” immediately after the reels are stopped, and the indication will be “GAME OVER” in other occasions. The indication will be hidden when the bonus game is triggered. When the status is WIN and GAMBLE is enabled, the indication will be “PLAY ON, GAMBLE or TAKE WIN” immediately after bonus game ends, and the indication will be “GAME OVER” in other occasions. 
     Immediately after the end of the jackpot, the indication will be “GAME OVER”. When the state is WIN and GAMBLE is enabled, the indication will be “PLAY ON, GAMBLE or TAKE WIN” when the help button is pressed and the help screen is displayed, and the indication will be “GAME OVER” in other occasions. When the help button is pressed to return to the game screen, the state before the help screen is displayed comes back. After the BET×XX is pressed and at the time of TAKE WIN, “GAME OVER” is indicated. 
     In the meanwhile, below the symbol display region  150  are provided a game rule button  416 , a payout table button  415 , and an audio button  414 , and a denomination button  413 . These buttons  413 ,  414 ,  415 , and  416  are arranged from the right end to the left end when viewed from the player. Further, above the game rule button  416  are displayed time indicator  417  indicating the current time. 
     The denomination button  413  displays the current denomination set in the AUDIT. This button is displayed when screens other than the AUDIT are displayed. The audio button  414  is used for adjusting the audio volume output from the slot machine  10 . As shown in  FIG. 24 , there are three levels in the audio volume, and the volume is successively switched every time the button is touched (minimum volume (30%)→medium volume (70%)→maximum volume (100%)→minimum volume→ . . . ). The default setting is the minimum volume. Further, after the game is booted, and when the AUDIT screen (setting screen) is hidden, the audio volume is reset to the default setting. It should be noted that, while the help screen is displayed, the audio button  414  is hidden. Therefore, the volume cannot be changed. However, the button is active in other occasions. An operation invalidating period of the audio button  414  is set to 0.15 seconds (150 msec) from the pressing of the button. The default sound volume setting value in the AUDIT is 12. The value is 5 when there is no sound volume adjustment touch panel. The volume of VOL setting changing sound in the AUDIT is set to the default of the audio button  414  (the volume reflecting the figure of minimum volume (30%)). The payout table button  415 , upon being touched, displays the payout table in the help pages. The game rule button  416 , upon being touched, displays the first page of the help pages. It should be noted that the game rule button  416  is inactive and is grayed out, while the reels are rotating and the like. 
     On both sides of the symbol display region  150 , a logo  418  indicating that there is no limitation by paylines (i.e., every way). 
     (Display Screen: Help Screen) 
     The following describes the help screen displayed by touching the game rule button  416  or the payout table button  415 . As shown in  FIG. 43 , the help screen has a help display region  421  in the middle portion of the lower image display panel  141 . Below the help display region  421  are displayed an EXIT touch button  422  for closing the help screen and returning to the normal game screen, a PREV touch button  423  for causing the help display region  421  to go 1 page back, a NEXT touch button  424  for causing the help display region  421  to go 1 page forward, a denomination button  413  similar to that described hereinabove, and a time indicator  417  similar to the one described hereinabove. 
     In the help display region  421  of the help screen, the following contents are displayed. 
     The first page shows “● Select bet multiplier. ● Select number of credits to play to start the game. ● All wins left to right in any position only. ● Each symbol appearing on a reel is counted once per winning combination. ● All wins shown in credits, except progressives. ● Highest win only on each way. ● All wins are multiplied by bet multiplier except scatters. ● All wins are multiplied by bet multiplier except scatters. ● Wins on different ways are added. ● Scatter wins are added to EVERY WAY wins. ●Malfunction voids all pays and plays. ● The player is responsible for checking that correct credit has been registered before commencing play.”
 
The second page shows “INCREASED SYMBOLS PER PLAY Different reels are used according to the selected number of credits played as displayed below. PLAY 60 CREDITS Reels have an increased number of [BAT], [GOURD], [FISH], [JAR] and [DRAGON]. PLAY 30 CREDITS Reels have an increased number of [BAT], [GOURD], [FISH] and [JAR]. PLAY 15 CREDITS Reels have an increased number of [BAT], [GOURD] and [FISH]. PLAY 5 CREDITS Reels have an increased number of [BAT] and [GOURD]. PLAY 1 CREDIT NORMAL REELS The increase in the number of each symbol is respective to the number of each symbol on normal reels.
 
The third page shows “EVERY WAY ● EVERY WAY provides for 243 ways to win. ● EVERY WAY wins are the winning combinations that appear left to right in any position. ● Only one symbol from each reel comprises each winning combination. The increase in the number of each symbol is respective to the number of each symbol on normal reels.”
 
The fourth page shows “FREE GAMES free game ● 3 or more [FEATURE], [WILD] or [×2WILD] appearing left to right trigger 10 FREE GAMES. ● Different reels are used during the FREE GAMES. ●FREE GAMES can be triggered again during the FREE GAMES. ● Credits bet and increased symbols played during the FREE GAMES are the same as the game that triggered the FREE GAMES.”
 
The fifth page shows the payout table shown in the first payout Table  1431  of  FIG. 25 , and further shows “PAYTABLE SUBSTITUTES [WILD] substitutes for all symbols except [×2WILD]. [WILD] appears on reels  2  and  4  only. [×2WILD] substitutes for all symbols. If [×2WILD] substitutes in a win the pay for that win is doubled. [WILD] appears on reels  3  and  4  only. “ ” written in combined form on [WILD] and [×2WILD] means “Bringing fortune and treasure. SCATTER CREDIT”
 
The sixth page shows the payout table shown in the second payout  1432  in  FIG. 25 , and further shows “PROGRESSIVE FEATURE ● There is a chance the PROGRESSIVE FEATURE may be triggered when [WILD] or [×2WILD] appear. ● IN the PROGRESSIVE FEATURE, 4 types of dragons are hidden behind 12 coins. ● Select a coin until 3 matching dragons corresponding to a PROGRESSIVE are revealed. ● When 3 matching dragons have been revealed, the corresponding PROGRESSIVE is won and the feature ends. ● PROGRESSIVE award amounts for each bet condition are displayed on the top screen. ● The chances of revealing each dragon are not equal. ● All wins cannot be gambled if the PROGRESSIVE is won, even if gamble game is available. DRAGONS/PROGRESSIVE [RED DRAGON]/GRAND PROGRESSIVE [PURPLE DRAGON]/MAJOR PROGRESSIVE [GREEN DRAGON]/MINOR PROGRESSIVE [BLUE DRAGON]/MINI PROGRESSIVE”.
 
The eighth page shows “● PLAY 0000 TO 0000 CREDITS ● ALL WINS PAID BY MACHINE OR ATTENDANT”.
 
     As should be seen, the help screen shows the payout tables indicating all the winning combinations, and describes basic rules, win lines, features (bonus game, free game, and the like), the range of bet amount, and the like. The payout tables are shown in the descending order from the highest payout. Further, regarding the basic rules, how the games are played, and the basic plays as the gamble game are described. As the win line, adoption of the every way mode having no limitation by the paylines is described. As the feature, a plurality of features are described in separate pages. When a different payout table from that of the normal game is adopted in the feature, the payout table is shown after the description of the rules of the feature. Further, if there is a feature unique to the game such as High, POWER, Max, Bet, Special, and the like, the rules for the feature is described. As the bet amount, a range of bettable amount in the game is indicated. 
     The following describes a process related to the help screen. When the game rule button  33  is pressed while the game rule button  33  is active, only the lower image display panel  141  switches to the help screen, while the basic screen on the upper image display panel  142  remains in the idling state. While an error takes place or during AUDIT, the LED of the game rule button  33  is turned off, and the game rule button  33  is turned inactive. On the help screen, the following process takes place. When an error or door open occurs, the help screen is hidden (i.e., the game screen is reinstated) and ERROR/DOOR OPEN is displayed. When a bill or a coin is inserted, the help screen is hidden and the credit is received. When an AUDIT key is rotated, the help screen is hidden and AUDIT is displayed. After that, when the idling state occurs if AUDIT is hidden. After power interruption, the help screen is not displayed when the power is turned on and the machine becomes in the idle state. If 3 minutes elapses without any input while the help screen is displayed, the help screen is closed. 
     (Display Screen: Win Effect Screen) 
     When a winning occurs in the normal game or in the free game, the following effect display is performed. As shown in  FIG. 44 , when two line winnings occur in the symbol display region  150  of the lower image display panel  141 , the winning combinations established are indicated by line indications  431  and  432 . The line indications  431  and  432  are alternated. At this time, on the upper image display panel  142 , a win image  187  such as the one with text reading “WIN 7 CREDITS” as shown in  FIG. 45  is displayed. In the win image  187 , incrementing of the credit by the credit won is displayed (linked to the win meter  402  of the lower image display panel  141 ). It is possible to use a plurality of types of win images  187 . For example, it is possible to use different types of win images  187  for a case where the total amount won is less than ×25 of the bet amount, or a case where the total amount won is ×25 or more but less than ×50 of the bet amount, and a case where the total amount won is ×50 or more of the bet amount. Further, when the total amount won is ×20 or more of the bet amount, there may be a period equivalent to 20 frames between the point of stopping all the pseudo reels  151  to  155  and displaying of the win effect screen. 
     The increment speed is such that, 24 ranks of credit won (winnings) are identified, and the increment speed is set for each rank. Further, a win sound associated with the increment speed is used. Specifically, as shown in  FIG. 46 , the increment speed is determined for each win which is variable depending on the total bet amount. That is, for each of win_1 to win_22, the speed for 1 increment is the result of dividing the credit won by the assigned seconds. This way, the increment is completed at a certain number of seconds. Further, for win_23 to win_24, the increment is carried out so that the credits are incremented by a ½ of the total bet amount in 1 second, until the amount of credit reaches ×20 of the bet amount. When the amount of incremented amount reaches the ×20 of the bet amount, the speed for 1 increment is the result of dividing the credit won by the remaining number of seconds. This way, the increment is completed at a certain number of seconds. 
     Further, when three or more trigger symbols  504  are rearranged, an audio effect is provided. Specifically, upon elapse of 20 frames from the point where all the pseudo reels  151  to  155  stop, a sound “jilililili . . . ” (bell ring like sound) is reproduced. After that, the above described win effect screen is displayed. 
     (Details of Display Screen: Win Meter  402 ) 
     As shown in  FIG. 47 , the win meter  402  displays an obtained credit and the details thereof in an integrated meter, when a winning is achieved. The win meter  402  includes a WIN total amount display region  4021 , a detail display region  4022 , and a total display region  4023 . 
     (Details of Display Screen: Win Meter  402 : WIN Totally Amount Display Region  4021 ) 
     The WIN total amount display region  4021  displays the obtained credit and money. Details of the image displays will be given below. In the idle state, the total amount of winning displayed is “0” immediately after the winning, and “0” is continuously displayed thereafter. When the spin button  46  is pressed, “0” is displayed. The increment display is executed during the WIN increment. “0” is displayed during a bonus pick trigger (because no winning is achieved during the trigger). 
     At the introduction of the free game, the total amount of immediately preceding winning is displayed. The total amount of immediately preceding winning is displayed during the rotation of the reels in the free game. At the moment immediately after the rotation of the reels and immediately after the winning in the free game, the winning achieved in the free game is added to the total amount of the preceding winning, and the increment display is carried out. In other cases, the total amount of the winning in the immediately preceding game is displayed. At the introduction of a bonus, the total amount of the immediately preceding winning is displayed Immediately after the end of the bonus, the credits obtained in a bonus or jackpot are added to the total amount of immediately preceding winning, and the increment display is carried out. 
     For example, credit display such as “12345678” is displayed on the upper stage, and money display such as “$123, 456, 78” is displayed in the lower stage. 
     (Details of Display Screen: Win Meter  402 : Detail Display Region  4022 ) 
     The detail display region  4022  displays the number of the winning line and the WIN credit after the stop of the fifth reel, when winning is achieved in the normal game or the free game. When more than one line payout simultaneously occurs, the line payouts are displayed one by one at intervals of 0.5 second. The line payouts are serially displayed from the winning line having the smallest number, and the one having the smallest number is displayed again after the one having the largest number is displayed. The detail display region  4022  displays a text string “bonus WIN” and WIN credits in case of winning with a bonus and credit payout. Furthermore, the detail display region  4022  displays a text string “jackpot WIN” and WIN credits in case of obtaining a bonus in the jackpot. 
     Details of the image displays will be given below. In case of immediately after a normal winning in the idle state, the detail of the payout is displayed. When there are more than one payout, the details of the payouts are switched at intervals of 0.5 second. Nothing is displayed in other cases. Nothing is displayed when the spin button  46  is pressed. Detail of the payout is displayed during the WIN increment. When there are more than one WIN increment, the WIN increments are switched at intervals of 0.5 second. Nothing is displayed at the time of a bonus pick trigger. Furthermore, nothing is displayed at the time of the introduction of a free game. Furthermore, nothing is displayed during the rotation of the reels in a free game. When a line winning exists immediately after the stop of the reels in a free game, the detail of the payout is displayed. When there are more than one payout, the details of the payouts are switched at intervals of 0.5 second. Nothing is displayed in other cases. 
     Nothing is displayed at the time of the introduction of a bonus. When a bonus (excluding jackpot) exists immediately after the end of the bonus, a bonus WIN is displayed, and a jackpot WIN is displayed when the jackpot is achieved. The bonus WIN is displayed immediately after achieving a credit payout. Nothing is displayed at the end of a bonus game (i.e., when returning to the game screen). 
     An example of the displayed image is “line symbol WIN=12345678”. This image display indicates a winning in a normal game or in a free game. An example of the displayed image for winning by the trigger symbol is “FEATURE WIN=12345678”. 
     (Details of Display Screen: Win Meter  402 : Total Display Region  4023 ) 
     The total display region  4023  displays the sum total of the amounts in the detail display region. Details of the image displays will be given below. The total winning is displayed in case of immediately after a normal winning in the idle state. Nothing is displayed in other cases. Nothing is displayed when the spin button  46  is pressed. The total winning is displayed during the WIN increment. Nothing is displayed at the time of a bonus pick trigger. Furthermore, nothing is displayed at the time of the introduction of a free game. Furthermore, nothing is displayed during the rotation of the reels in a free game. When a line winning exists immediately after the stop of the rotation of the reels in a free game, the total winning is displayed. Nothing is displayed in other cases. Nothing is displayed at the time of the introduction of a bonus. The total winning is displayed immediately after the end of a bonus. The total winning is displayed immediately after winning a credit payout. Nothing is displayed at the end of a bonus game (i.e., when returning to the game screen). An example of the displayed image is “total WIN=12345678”. 
     (Control Panel  30 ) 
     Below the lower image display panel  141 , as shown in  FIG. 48 , a control panel  30  is provided. The control panel  30  is provided with buttons, a coin entry  21  for inserting coins into the cabinet  11 , and a bill entry  22 . 
     Specifically, the control panel  30  has a take-win/collect button  32 , the reserve button  45 , and the game rule button  33  ([GAME RULES] button) on the left side area of its upper stage, and a 1-bet button  34 , a 2-bet button  35 , a 3-bet button  36 , a 5-bet button  37 , a 10-bet button  38  on the left side area of its central stage. Furthermore, on the control panel  30 , a play-1 credit button  40 , a play-5 credit button  41 , a play-15 credit button  42 , a play-30 credit button  43 , and a play-60 credit button  44  are provided in the lower stage of the left area. The control panel  30  has the gamble button  31  and the spin button (repeat bet/start feature button)  46  in the lower right side area. 
     Further, as shown in  FIG. 48 , a name labels are provided to the credit buttons  40  to  44 . Specifically, the play-1 credit button  40  is labeled “NORMAL REELS”, and is colored in white. Further, the play-5 credit button  41  is labeled “IRON REELS”, and is colored in gray. Further, the play-15 credit button  42  is labeled “BRONZE REELS”, and is colored in bronze. Further, the play-30 credit button  43  is labeled “SILVER REELS”, and is colored in silver. Further, the play-60 credit button  44  is labeled “GOLD REELS”, and is colored in gold. When these credit buttons  40  to  44  are operated, the external appearance of the credit buttons  40  to  44  are displayed on the lower image display panel  141 . 
     Specifically, when a game started, selecting any of the credit buttons  40  to  44  as the symbol bet, a button image  420  having the external appearance of the credit button corresponding to the selected symbol bet is displayed in the areas (on both sides of the symbol display region  150 ) of the lower image display panel  141  where the logo  418  (see  FIG. 24 ) is arranged, as shown in  FIG. 49 .  FIG. 49  shows an example case where the play-60 credit button  44  as the symbol bet is operated, and the button image  420  of “GOLD REELS” is displayed. 
     The control panel  30  makes it possible to conduct selections in the same manner as those by the touch panel, on various types of selection screens. For example, the cursor is moved leftward as the 1-BET button  34  is touched, and the cursor is moved rightward as the 10-BET button  38  is touched. When the operation is carried out, the light source in each button is preferably turned on. 
     The reserve button  45  is used when a player leaves the machine or when the player asks a staff person of the gaming facility to exchange money. When the reserve button  45  is pressed, a reserve symbol  1460  counting down 3 minutes is displayed on the lower image display panel  141 , as shown in  FIG. 50 , and a 3 minute standby period is started. It should be noted that the reserve button  45  is active when the status is Game Over. Further, the reserve button  45  is turned off and inactive, while the reels are spinning, during an win increment (not Game Over state), while the help screen is displayed, when an error takes place, while an effect screen that can be cancelled is displayed, and during RS accounting. Reserve symbol  1460  disappears after elapse of 3 minutes, or when the reserve button  45  is pressed while the reserve symbol  1460  is displayed. The gamble button  31  is an operation button used for, for example, shifting to the gamble game after the end of the bonus game or the like. The gamble game is a game played with the consumption of an obtained credit. The take-win/collect button  32  is a so-called settlement button by which credit data concerning credits obtained in games is added to the credit data stored in an IC card inserted into the PTS terminal  700 . The game rule button  33  is pressed when, for example, it is unclear how to play a game. As the game rule button  33  is pressed, various help information is displayed on a later-described effect mechanism  131  and lower image display panel  141 . 
     Each time the 1-BET button  34  is pressed, one of the credits currently owned by the player is bet on each active line. The 2-BET button  35  is used to start a game with two credits bet on each active line. The 3-BET button  36  is used to start a game with three credits bet on each active line. The 5-BET button  37  is used to start a game with five credits bet on each active line. The 10-BET button  38  is used to start a game with ten credits bet on each active line. As such, the bet amount on each active line determined by pressing the 1-BET button  34 , the 2-BET button  35 , the 3-BET button  36 , the 5-BET button  37 , and the 10-BET button  38 . It should be noted that the designs of the buttons for betting may be modified according to the modification of the bet amount that can be bet. For example, it is possible to provide bet buttons which enable betting of credits “1”, “2”, “3”, “4”, and “5”. In this case, the designs of the bet buttons may be “BET×1”, “BET×2”, “BET×3”, “BET×4”, and “BET×5”, respectively. Further, for example, it is possible to provide bet buttons which enables betting of credits “1”, “2”, “5”, “10”, and “15”. In this case, the designs of the bet buttons may be “BET×1”, “BET×2”, “BET×5”, “BET×10”, and “BET×15”, respectively. Further, for example, it is possible to provide bet buttons which enables betting of credits “1”, “2”, “5”, “10”, and “20”. In this case, the designs of the bet buttons may be “BET×1”, “BET×2”, “BET×5”, “BET×10”, and “BET×20”, respectively. 
     The spin button  46  is a button used for starting the scroll of the symbol array having the symbols  501 . It is for starting the spin with the similar bet. This spin button  46  also functions as a button for starting a bonus game and for adding a payout awarded in a bonus game to the credits. It should be noted that, if game start with the same betting conditions as the previous game (bet amount, activated line number) is possible by the spin button  46 , the design of the spin button  46  may be “REPEAT BET”. The coin entry  21  is used for receiving coins into the cabinet  11 . The bill entry  22  validate bills and receives genuine bills into the cabinet  11 . 
     (Operations of Slot Machine  10 : Gamble Game) 
     As shown in  FIG. 51 , when the money is lower than the processable value such as one dollar, a “RESIDUAL GAMBLE” screen is displayed if a gamble start condition such as the pressing of a collect button is satisfied (F 253 ). When the gamble button is pressed, Gamble starts. On the other hand, when the collect button is pressed, Call Attendant is displayed (F 254 ). When the spin button  46  is pressed, the screen of the normal game comes back (F 255 ). 
     When “WIN” is achieved in Gamble (F 256 ), a predetermined amount of money such as one cent is awarded and a token is paid out through the hopper. In addition to the above, the addition to the credit meter is executed (F 257 ). Thereafter, after a predetermined time such as two seconds elapses, the screen of the normal game comes back (F 258 ). On the other hand, when “LOSE” appears in Gamble (F 259 ), a LOSE screen is displayed (F 260 ). Thereafter, after a predetermined time such as two seconds elapses, the screen of the normal game comes back (F 261 ). 
     The roles of the buttons in the progress of the gamble game will be described. In the take-win/collect button  32 , GAMBLE ON corresponds to “TAKE WIN” and GAMBLE OFF corresponds to “TAKE WIN”. In the gamble button  31 , GAMBLE ON corresponds to “Gamble Start” and GAMBLE OFF corresponds to “−”. In the BET button, GAMBLE ON corresponds to “Invalidated” and GAMBLE OFF corresponds to “Gamble Start”. In the spin button  46 , GAMBLE ON corresponds to “To Normal Game” and GAMBLE OFF corresponds to “To Normal Game”. 
     As shown in  FIG. 52 , the “RESIDUAL GAMBLE” screen has a card display area, a navigation area, and a meter area. In the card area is displayed a card image. The entirety of the card area has a touch sensor function. On the navigation area, various navigation texts are displayed. 
     The limit of the value winnable in Gamble is set in the AUDIT. The maximum number of times of Gamble is also set in the AUDIT. For example, the maximum number of times is set at five and the number of times of Gamble is set so as to be five or lower. Whether the touch panel can be used is switchable in some countries. 
     As shown in  FIG. 53 , when the shifting to the gamble game occurs, the message “PLAY ON, GAMBLE or TAKE WIN RED” disappears. Immediately after the clearance of the RAM, the card history is empty until the gamble game is played. A message “SELECT RED OR BLACK OR TAKE WIN” is displayed. 
     In the gamble screen, a heart-shaped red button and a spade-shaped black button are turned on and a TAKE WIN button at the center is turned on. The other buttons are turned off. 
     Subsequently, as shown in  FIG. 54 , the amount bet on “GAMBLE AMOUNT” is displayed. Then one of the heart-shaped red button, the spade-shaped black button, and the TAKE WIN button at the center on the gamble screen is selected. When the TAKE WIN button is selected, the amount of WIN is added to the credits at once and the idle state comes back. 
     In case of failure in Gamble, as shown in  FIG. 55 , non-selected options are darkened. At the left end of the gamble history field, the card history is displayed at once. The preceding card history moves right. The trace of the movement is not illustrated in animation, and hence the history is rewritten at once. The central card result is displayed at once. At this stage, there are no changes in the win meter and the gamble meter. Sound indicating hard luck is output and the shifting to the normal game occurs after several seconds. 
     In case of Success in Gamble, as shown in  FIG. 56 , non-selected options are darkened. At the left end of the gamble history field, the card history is displayed at once. The preceding card history moves right. The trace of the movement is not illustrated in animation, and hence the history is rewritten at once. On the central card, a normal card and a card with a WIN text are alternately displayed at intervals of one frame, and success sound is output for a predetermined time. To the win meter, the value increase as a result of Gamble is added at once. When the player plays the gamble game until reaching the maximum number to times, the value won is added to the credits at once and the idle state comes back. As shown in  FIG. 56 , when the player has not played the gamble game until reaching the maximum number to times, a card is turned inside out and the gamble game is continued. 
     Embodiments of the present invention thus described above solely serve as specific examples of the present invention, and are not to limit the scope of the present invention. The specific structures and the like are suitably modifiable. Further, the effects described in the embodiments of the present invention described in the above embodiment are no more than examples of preferable effects brought about by the present invention, and the effects of the present invention are not limited to those described hereinabove. 
     (Modification) 
     The following describes a modification. It should be noted that descriptions for structures similar to the above embodiment are omitted. 
     (Informing Specific Symbol with Increased Percentage) 
     For example, the lower image display panel  141  or the upper image display panel  142  may be configured to display the specific symbol  503  with an increased percentage. 
       FIG. 61  is an explanatory diagram illustrating an example modification of the display screen of the lower image display panel  141 . As described in the above embodiment, the number of specific symbols  503  with respect to the number of all the symbols  501  in all the symbol arrays  170  increases with an increase in the bet amount by the player. For example, when the credit button  41  is selected, the number of bat symbols  503   e  and the number of gourd symbols  503   d  in the symbol arrays  170  are more than those when the credit button  40  is selected. In the present modification, as shown in  FIG. 61 , an information image  440  which informs the specific symbol  503  with an increased percentage is informed is displayed at the lower right part of the lower image display panel  141 . The increased symbol image  440  presents, in the form of an image, the specific symbol  503  whose percentage in the symbol arrays  170  is increased in the current game, and indicates that the percentage of the specific symbol  503  in the symbol arrays  170  is increased. In the example of  FIG. 61 , the increases in the percentages of the bat symbol  503   e  and the gourd symbol  503   d  in the symbol arrays  170  are informed. 
       FIG. 62  is an explanatory diagram illustrating an example modification of the display screen of the upper image display panel  142 . As shown in  FIG. 62 , during a game with an increased percentage of the specific symbol  503  in the symbol arrays  170 , the increase in the percentage of the specific symbol  503  may be indicated in the payout table. In the example of  FIG. 62 , the information image  441  indicating the increase in the percentage is displayed for the bat symbol  503   e  and the gourd symbol  503   d  in the payout table. 
       FIG. 63  is an explanatory diagram showing a modification of the help screen. As shown in  FIG. 63 , an increased symbol description page  442  may be provided in the first page of the help screen, which describes the specific symbols  503  which stepwisely increase for every increase in the bet amount. Specifically, the increased symbol description page  442  displays five symbol bet images  442   a  each of which indicates possible bet amounts in multiple steps, in the form of a number of stars and a value; and for each symbol bet image  442   a , displays a corresponding increased symbol image  442   b  indicating in the form of text and images the types of specific symbols  503  whose percentages in the symbol arrays  170  are increased. The five symbol bet images  442   a  correspond to the credit buttons  40  to  44 , respectively, and clarifies which types of specific symbols  503  are increased for using which types of credit buttons  40  to  44 . It should be noted that in the present modification, the credit buttons  40  to  44  place a credit amounts of 8, 18, 38, 68, and 88, respectively. 
     (Trigger for Bonus Game) 
     The above embodiment executes the first random determination to determine whether to trigger the bonus game, with a probability corresponding to the number of wild symbols  505  rearranged, and further executes the second random determination, apart from the first random determination, to determine whether to trigger the bonus game every time the normal game is run. However, the present invention is not limited to this. In the present modification, the above described second random determination is not executed, and executes a third random determination for determining whether to trigger the bonus game, when there is a payout based on a dragon symbol  503   a  which is the specific symbol  503   a  yielding the highest payout (top symbol). By the payout based on the dragon symbol  503   a , it means a payout resulting from rearrangement of three or more dragon symbols  503   a , or a payout resulting from rearrangement of three or more dragon symbols  503   a  and the wild symbols  505 . As described, in the present modification, the bonus game is triggered by the first random determination and the third random determination It should be noted that the third random determination is executed only in the normal game. 
     As shown in  FIG. 64 , the wild symbol random determination table stores values used in the first random determination. These values are different depending on the type of symbol bets (SBB 1  to SBB 5 ), and are selected according to the setting values (V 1  to V 7 ). Further, as shown in  FIG. 64 , the wild symbol random determination table is selected out of five different tables according to the setting values (SC 01  to SC 48 ) set by AUDIT. 
     The first random determination is executed with probabilities where the denominator is the value selected from the wild symbol random determination table, and the numerator is the value resulting from multiplication of a product of the number of wild symbols  505  appeared and 10000000000000, further multiplied by a set magnification factor of bet buttons  34  to  38 . 
     As shown in  FIG. 65 , a top symbol random determination table stores values used in the third random determination. These values are different depending on the type of symbol bets (SBB 1  to SBB 5 ), and are selected according to the setting values (V 1  to V 7 ). Further, as shown in  FIG. 65 , the top symbol random determination table is selected out of five different tables according to the setting values (SC 01  to SC 48 ) set by AUDIT. 
     The third random determination is executed with probabilities where the denominator is the value selected from the top symbol random determination table, and the numerator is the value resulting from multiplication of a product of the number of wild symbols  505  appeared and 10000000000000, further multiplied by a set magnification factor of bet buttons  34  to  38 . 
       FIG. 66  is a flowchart of a modification of the normal game running process. Step S 80  to S 83  are the same as step S 11  to S 13  of the normal game running process shown in  FIG. 40 . In the present modification, the mystery random determination of step S 14  is not executed, and the normal game symbol determination process as in step S 15  is executed (S 84 ), and then the scroll display control process as in step S 16  is executed (S 85 ). After that, step S 86  to S 92  are executed similarly to step S 19  to S 25 . 
     Next, the main CPU  71  determines whether or not three or more dragon symbols  503   a  are rearranged (S 93 ). When three or more dragon symbols  503   a  are rearranged (S 93 :YES), the random determination for the bonus game is executed according to the number of wild symbols, and whether or not the bonus game is won is determined (S 94 ). Then, if the bonus game is won, the bonus game is run (S 95 ). When three or more dragon symbols  503   a  are not rearranged (S 93 :NO), when the bonus game is not won (S 94 : NO), or after the bonus game triggered by rearrangement of three or more dragon symbols  503   a , the present routine is terminated. 
     As described, the bonus game is triggered by the first random determination and the third random determination Therefore, when a wild symbol  505  and three or more dragon symbols  503   a  are rearranged in the symbol display region  150  and the both first random determination and the third random determination result in a win, the bonus game will be run twice. 
     (Bonus Game) 
     In the above embodiment, the bonus game is run with the same conditions no matter which one of the credit buttons  40  to  44  is selected in the normal game triggering the bonus game. However, the present invention is not limited to this. For example, the obtainable bonus type may be limited from the plurality of bonus types with stepwisely set advantage levels (i.e., Grand Bonus, Major Bonus, Minor Bonus, Mini Bonus), based on the credit buttons  40  to  44  used. 
     Specifically, in the present modification, the Grand Bonus, Major Bonus, Minor Bonus, and Mini Bonus are obtainable from a bonus game triggered by a normal game in which the credit button  43  or  44  is selected (hereinafter, first bonus game). Further, the Major Bonus, Minor Bonus, and Mini Bonus are obtainable from the bonus game triggered by the normal game in which any one of the credit buttons  40  to  42  is selected (hereinafter, second bonus game). The first bonus game is the same as that in the above embodiment, and therefore no further description is provided below. The following describes the second bonus game. 
     As shown in  FIG. 67 , when the second bonus game is started, a plurality of selectable images  1421  are displayed on the lower image display panel  141 . While the first bonus game displays  14  selectable images  1421 , the second bonus game displays  11  selectable images  1421 . Since two bonus rank images  1422  for Grand Bonus and one double bonus rank image  1422   e  for Grand Bonus are excluded, the number of selectable images  1421  as a whole is reduced. Therefore, in the second bonus game, any one of the Major Bonus, Minor Bonus, and Mini Bonus is selectable. 
     Further, the lower image display panel  141  is provided with a rank count region  1423  which displays the count of each type of the bonus rank images  1422 . Since three types of bonuses, i.e., Major Bonus, Minor Bonus, and Mini Bonus are selectable in the second bonus game, there are rank count regions  1423  corresponding to these three types of bonuses. The rank count region  1423  is provided with a predetermined number (four) of count images  1423   a  for each type of the bonus rank image  1422 . Every time the bonus rank image  1422  is displayed, the number of the bonus rank images  1422  is counted for each type, and the count values are indicated on the rank count region  1423 . That is, the predetermined number of count images  1423   a  are changed so as to be the same as the bonus rank images  1422 . 
     The slot machine  10 , in the second bonus game, determines one bonus type out of the Major Bonus, Minor Bonus, and Mini Bonus before an effect display related to the second bonus game is provided. The slot machine  10  controls the lower image display panel  141  so that the number of the bonus rank images  1422  corresponding to the bonus determined reaches a predetermined number (e.g., four) in the effect display. That is, the player selects the selectable images  1421 , and when the number of a type of bonus rank images  1422  reaches the predetermined number, the player is entitled to the bonus type which corresponds to that type of bonus rank image  1422 . 
       FIG. 68  shows an example situation where the Minor Bonus is won in the second bonus game. Specifically, as the result of the player picking the selectable images  1421 , four Minor Rank images  1422   c  are displayed, achieving the predetermined number (four). As to the double bonus rank image  1422   e , the selection includes only that counted as the Major Bonus. 
     In the first bonus game and the second bonus game, the following tables are used for random determination and the like. It should be noted that the values in each table are modifiable by setting the setting values (SC 01  to SC 48 ) through AUDIT and the like. 
     As shown in  FIG. 69 , a progressive initial value table stores initial values of the first bonus game and the second bonus game. The slot machine  10  determines the initial value of the progressive awarded as the payout in the bonus game, by referring to the progressive initial value table. 
     As shown in  FIG. 70 , a progressive default increment rate table stores the default increment rates of the first bonus game and the second bonus game. The slot machine  10  determines the variation rate of the progressive by referring to the progressive default increment rate table. 
     It should be noted that limits are provided to the progressive values, and the limits are 999999999.99 dollars for Grand Bonus, 9999999.99 dollars for Major Bonus, 999999.99 dollars for Minor Bonus, and 999999.99 dollars for Mini Bonus. 
     Further, as shown in  FIG. 71 , a first bonus game random determination table stores weighting values for randomly determining any of the Grand Bonus, Major Bonus, Minor Bonus, and Mini Bonus in the first bonus game. That is, values deriving from fractions with a total of these weighting values as the denominator, and the respective weighting values as the numerators are the probabilities of winning bonuses in the first bonus game. 
     Further, as shown in  FIG. 72 , a second bonus game random determination table stores weighting values for randomly determining any of the Major Bonus, Minor Bonus, and Mini Bonus in the second bonus game. That is, values deriving from fractions with a total of these weighting values as the denominator, and the respective weighting values as the numerators are the probabilities of winning bonuses in the second bonus game. 
     As described, with an increase in the bet amount by the player, the upper limit of the obtainable bonus may be set higher in the bonus game triggered when predetermined condition is met by the result of the normal game run by the bet. 
     As shown in  FIG. 73 , the bonus description page  443  on the help screen describing the bonus game explains that the obtainable types of bonuses out of the plurality of bonus types with stepwisely set advantage levels are limited according to which credit buttons out of credit buttons  40  to  44  are used. In the present modification, there are five levels (extreme levels) which are selected according to the credit buttons  40  to  44 . The bonus description page  443  explains that four types of bonuses (Grand Bonus, Major Bonus, Minor Bonus, and Mini Bonus) are obtainable from a bonus game triggered by a normal game of level 4 or level 5 which is started by selecting the credit button  43  or  44 . Further, the bonus description page  443  explains that three types of bonuses (Major Bonus, Minor Bonus, and Mini Bonus) are obtainable from a bonus game triggered by a normal game of level 1 to level 3 which is started by selecting the credit button  40  to  42 . 
     (First Modification of Symbol Arrays for Normal Game and Free Game) 
     In the above embodiment, the number of the wild symbols  505  is the same both in the normal game and the free game. However, the present invention is not limited to this. Further, the above embodiment involves the normal wild symbols  505   a  and the double wild symbols  505   b ; however, the present invention is not limited to this and it is possible to involve only the normal wild symbols  505   a.    
       FIG. 74  shows symbol arrays in the normal game with the symbol bet of 1. As shown in  FIG. 74 , the wild symbol  505  is arranged in the positions of “11” of the second reel, “15” and “45” of the third reel, and “36” of fourth reel. That is, the probability of having the wild symbol  505  rearranged on the second reel in the symbol display region  150  is 3/68; the probability of having the wild symbol  505  rearranged on the third reel in the symbol display region  150  is 6/64; and the probability of having the wild symbol  505  rearranged on the fourth reel in the symbol display region  150  is 3/64. 
       FIG. 75  and  FIG. 76  show symbol arrays in the free game triggered by the normal game with the symbol bet of 1. As shown in  FIG. 75  and  FIG. 76 , the wild symbol  505  is arranged in the positions of “9” of the second reel, “0”, “1” and “2” of the third reel, and “34” of fourth reel. That is, the probability of having the wild symbol  505  rearranged on the second reel in the symbol display region  150  is 3/96; the probability of having the wild symbol  505  rearranged on the third reel in the symbol display region  150  is 100%; and the probability of having the wild symbol  505  rearranged on the fourth reel in the symbol display region  150  is 3/61. 
     As described, as compared with the normal game with the symbol bet of 1, the wild symbol  505  is set to stop throughout the third reel in the free game of symbol bet of 1. Therefore, the first random determination for the bonus game, which is executed when the wild symbol  505  stops, is always executed every time rearrangement takes place in the free game. 
       FIG. 77  shows symbol arrays in the normal game with the symbol bet of 5. As shown in  FIG. 77 , the wild symbol  505  is arranged in the positions of “11”, “17”, and “44” of the second reel, “3”, “15”, and “46” of the third reel, and “36” and “51” of fourth reel. That is, the probability of having the wild symbol  505  rearranged on the second reel in the symbol display region  150  is 9/60; the probability of having the wild symbol  505  rearranged on the third reel in the symbol display region  150  is 9/60; and the probability of having the wild symbol  505  rearranged on the fourth reel in the symbol display region  150  is 6/60. 
     As described, as compared with the normal game with the symbol bet of 1, the symbol arrays are modified so that the wild symbol  505  is rearranged at a higher probability in the normal game with the symbol bet of 5. 
       FIG. 78  shows symbol arrays in the free game triggered by the normal game with the symbol bet of 5. As shown in  FIG. 75  and  FIG. 76 , the wild symbol  505  is arranged in the positions of “0”, “10”, “16”, and “43” of the second reel, “0”, “1” and “2” of the third reel, and “0”, “35”, and “50” of the fourth reel. That is, the probability of having the wild symbol  505  rearranged on the second reel in the symbol display region  150  is 12/59; the probability of having the wild symbol  505  rearranged on the third reel in the symbol display region  150  is 100%; and the probability of having the wild symbol  505  rearranged on the fourth reel in the symbol display region  150  is 9/59. 
     As described, as compared with the normal game with the symbol bet of 5, the wild symbol  505  is set to stop throughout the third reel in the free game of symbol bet of 5. Therefore, the first random determination for the bonus game, which is executed when the wild symbol  505  stops, is always executed every time rearrangement takes place in the free game. Further, as compared with the free game with the symbol bet of 1, the symbol arrays are modified so that the wild symbol  505  is rearranged at a higher probability in the free game with the symbol bet of 5. 
     As described, the symbol arrays are modified so that the wild symbol  505  is rearranged at a higher probability in the free game than the normal game. Further, the symbol arrays are modified so that the larger the bet amount, the higher the probabilities of having the wild symbol  505  rearranged, in either the normal game or the free game. Further, in the free game, a reel with a symbol array entirely constituted of wild symbol  505  is provided so that the wild symbol  505  is always stopped. 
     (Second Modification of Symbol Arrays for Normal Game and Free Game) 
       FIG. 79  shows symbol arrays in the normal game with the symbol bet of 1. As shown in  FIG. 79 , the wild symbol  505  is arranged in the positions of “11” of the second reel, “15” and “45” of the third reel, and “36” of fourth reel. That is, the probability of having the wild symbol  505  rearranged on the second reel in the symbol display region  150  is 3/68; the probability of having the wild symbol  505  rearranged on the third reel in the symbol display region  150  is 6/64; and the probability of having the wild symbol  505  rearranged on the fourth reel in the symbol display region  150  is 3/64. 
       FIG. 80  shows symbol arrays in the free game triggered by the normal game with the symbol bet of 1. As shown in  FIG. 75  and  FIG. 76 , the wild symbol  505  is arranged in the positions of “5”, “6”, and “7” of the second reel, “14”, “15” and “16” of the third reel, and “3”, “4”, and “5” of the fourth reel. That is, the probability of having the wild symbol  505  rearranged on the second reel in the symbol display region  150  is 5/49; the probability of having the wild symbol  505  rearranged on the third reel in the symbol display region  150  is 5/43; and the probability of having the wild symbol  505  rearranged on the fourth reel in the symbol display region  150  is 5/42. 
     As described, as compared with the normal game with the symbol bet of 1, the symbol arrays are modified so that the wild symbol  505  stops at a higher probability in the free game with the symbol bet of 1. Further, the wild symbol  505  is arranged continuously in the symbol array, the wild symbol  505  could stop one after another on the same reel. Therefore, it is likely to win a high payout or increase the probabilities of winning in the first random determination for the bonus game. 
       FIG. 81  shows symbol arrays in the normal game with the symbol bet of 5. As shown in  FIG. 81 , the wild symbol  505  is arranged in the positions of “11”, “17”, and “44” of the second reel, “3”, “15”, and “46” of the third reel, and “36”, and “51” of the fourth reel. That is, the probability of having the wild symbol  505  rearranged on the second reel in the symbol display region  150  is 9/60; the probability of having the wild symbol  505  rearranged on the third reel in the symbol display region  150  is 9/60; and the probability of having the wild symbol  505  rearranged on the fourth reel in the symbol display region  150  is 6/60. 
     As described, as compared with the normal game with the symbol bet of 1, the symbol arrays are modified so that the wild symbol  505  is rearranged at a higher probability in the normal game with the symbol bet of 5. 
       FIG. 82  shows symbol arrays in the free game triggered by the normal game with the symbol bet of 5. As shown in  FIG. 75  and  FIG. 76 , the wild symbol  505  is arranged in the positions of “4”, “5”, “17”, “18”, “19”, “46”, and “47” of the second reel, “3”, “4”, “28”, “29”, “30”, “53” and “54” of the third reel, and “32”, “33”, “34”, “51”, and “52” of the fourth reel. That is, the probability of having the wild symbol  505  rearranged on the second reel in the symbol display region  150  is 13/60; the probability of having the wild symbol  505  rearranged on the third reel in the symbol display region  150  is 13/60; and the probability of having the wild symbol  505  rearranged on the fourth reel in the symbol display region  150  is 9/60. 
     As described, as compared with the normal game with the symbol bet of 5, the symbol arrays are modified so that the wild symbol  505  stops at a higher probability in the free game with the symbol bet of 5. Further, the wild symbol  505  is arranged continuously in a plurality of positions in the symbol array, the wild symbol  505  could stop one after another on the same reel. Therefore, it is likely to win a high payout or increase the probabilities of winning in the first random determination for the bonus game. Further, as compared with the free game with the symbol bet of 1, the symbol arrays are modified so that the wild symbol  505  is rearranged at a higher probability in the free game with the symbol bet of 5. 
     As described, the symbol arrays are modified so that the wild symbol  505  is rearranged at a higher probability in the free game than the normal game. Further, the symbol arrays are modified so that the larger the bet amount, the higher the probabilities of having the wild symbol  505  rearranged, in either the normal game or the free game. Further, in the free game, the wild symbol  505  is arranged continuously on the symbol array so that the wild symbol  505  stops in a plurality of positions of the single reel. 
     (Coin Effect) 
     As shown in  FIG. 83 , after rearrangement takes place for all the pseudo reels  151  to  155 , a coin effect may be provided such that coins  444  fall from the top and the amount of piled up coins  444  at the bottom changes. The coin effect is executed four times and the display on the screen changes in five steps. Specifically, four times of changes take place to reach the ultimate screen display; i.e., changes from the first stage which is the initial display to the second stage, from the second stage to the third stage, from the third stage to the fourth stage, and from the fourth stage to the fifth stage. 
       FIG. 84  shows a coin sorting table. Each change occurs when the game count reaches a predetermined count based on the coin sorting table and the probability of winning the bonus game. Specifically, the following describes how the game count for executing the coin effect is calculated, using the coin sorting table. First, any one of (A) to (C) is randomly selected. The probabilities of having (A) to (C) selected are the same. In the coin sorting table, the X field stores approximately at what percentage the coin effect is executed. For example in case of (A), the coin effect is executed at every 25% of a theoretical game count (100%) which is calculated from the probability of winning the bonus game. For example, where the probability of winning the bonus game is 1/400, the count of games before the bonus game is 400. 
     In the coin sorting table, the Y field stores values each deriving from dividing the total of the values in the X fields (i.e., 100) by a value in the corresponding X field. A value resulting from dividing the game count by the Y field value is the number of games before the coin effect. For example in (A), the coin effect takes place at the 100th game from the occurrence of the bonus game. Subsequently, the coin effect takes place at the 200th game, 300th game, and 400th game. That is, the game count reset by occurrence of the bonus game is stored in the memory. 
     It should be noted that if the bonus game does not occur after the coin effect of the fifth stage, the random determination may be executed every time the wild symbol  505  stops and may further execute the coin effect. For example, it is possible to execute the random determination for winning the coin effect at a probability of 20%. Further, the amount of coins  444  piled up at the bottom does not have to be changed. Repeating the coin effect until the bonus game occurs causes the expectation of the player for the bonus game. 
     (Effect of Concurrent Winning) 
     As described above, the bonus game is triggered by the wild symbol random determination and a top symbol random determination. Since the normal game may involve the both wild symbol random determination and the top symbol random determination, there is a possibility that the both random determinations may result in a winning. In cases of the concurrent winnings, the bonus game is run twice, and an effect for concurrent winnings is provided between the bonus game of the first time and that of the second time. This effect for concurrent winnings is described below. 
     As shown in  FIG. 35 , the bonus game of the first time is run, and the result is displayed. Subsequently, the display on the lower image display panel  141  returns to the state showing rearrangement of symbols  501  in the symbol display region  150  in the normal game having triggered the bonus game. At this time, the amount of coins  444  piled up by the coin effect is reset to the first stage, i.e., to the initial display. 
     Then, as shown in  FIG. 85 , there will be an animation showing the coins  445  falls down from the top to the left and right directions of the symbol display region  150  on the lower image display panel  141 . 
     Further, as shown in  FIG. 86 , there will be an animation showing the coins  446  falls down from the top to the middle portion of the symbol display region  150  on the lower image display panel  141 . After this, the bonus game of the second time is run. 
     Further, the detailed description above is mainly focused on characteristics of the present invention to fore the sake of easier understanding. The present invention is not limited to the above embodiments, and is applicable to diversity of other embodiments. Further, the terms and phraseology used in the present specification are adopted solely to provide specific illustration of the present invention, and in no case should the scope of the present invention be limited by such terms and phraseology. Further, it will be obvious for those skilled in the art that the other structures, systems, methods or the like are possible, within the spirit of the present invention described in this specification. The description of claims therefore shall encompass structures equivalent to the present invention, unless otherwise such structures are regarded as to depart from the spirit and scope of the present invention. Further, the abstract is provided to allow, through a simple investigation, quick analysis of the technical features and essences of the present invention by an intellectual property office, a general public institution, or one skilled in the art who is not fully familiarized with patent and legal or professional terminology. It is therefore not an intention of the abstract to limit the scope of the present invention which shall be construed on the basis of the description of the claims. To fully understand the object and effects of the present invention, it is strongly encouraged to sufficiently refer to disclosures of documents already made available. 
     The detailed description of the present invention provided hereinabove includes a process executed on a computer. The above descriptions and expressions are provided to allow the one skilled in the art to most efficiently understand the present invention. A process performed in or by respective steps yielding one result or blocks with a predetermined processing function described in the present specification shall be understood as a process with no self-contradiction. Further, the electrical or magnetic signal is transmitted/received and written in the respective steps or blocks. It should be noted that such a signal is expressed in the form of bit, value, symbol, text, terms, number, or the like solely for the sake of convenience. Although the present specification occasionally personifies the processes carried out in the steps or blocks, these processes are essentially executed by various devices. Further, the other structures necessary for the steps or blocks are obvious from the above descriptions.