Patent Publication Number: US-8968072-B2

Title: Gaming machine and control method thereof

Description:
TECHNICAL FIELD 
     The present invention relates to a gaming machine and a gaming machine control method. 
     BACKGROUND 
     In general, a slot machine, which is one kind of gaming machine, includes, as an important component thereof, a symbol display unit for variably displaying and stopping a plurality of symbols for each column. 
     Such slot machines can be roughly divided, based on forms of the symbol display unit, into two types: those adopting a mechanical reel and those adopting a simulated reel as the symbol display unit. The mechanical reel type includes multiple reels having multiple kinds of symbol along the periphery, and the symbols can be variably displayed and stopped by mechanically rotating and stopping the reels. The combination of the stopped symbols may form a winning combination with which a player is awarded. And display effects are performed to amuse a player, as well as to inform the game state. 
     U.S. Pat. No. 5,752,881 discloses a gaming machine having outer and inner reels and a display window. A plurality of symbols are spaced peripherally about the outer reel. Each of the symbols is transparent with an opaque portion disposed inside and/or outside the transparent symbol. The inner reel is rotatable inside the outer reel. A plurality of different colored patterned portions are disposed in a peripheral series about the inner reel. One of the patterned portions stopped in the display window becomes observable through the transparent portion when the transparent symbol is stopped in the display window and is combined with the transparent symbol. 
     U.S. Pat. No. 7,380,791 discloses a gaming machine using controllable LEDs for reel strip illumination. A backlight for a reel assembly comprises a plurality of light emitting diodes (LEDs). An array of red, green, and blue diodes are positioned behind a translucent reel strip to backlight three adjacent symbols on a reel strip. The LEDs are individually controllable to vary the color output of the LED array for a full spectrum of colors, including white. Groups of LEDs can be illuminated to optimally illuminate any number of symbols of any size. The LEDs may be controlled to highlight special symbols such as by blinking or changing colors. 
     SUMMARY 
     An aspect of the present invention is a gaming machine, which includes: a game controller; and a mechanical symbol display unit controlled by the game controller for displaying a plurality of symbols in such a way that a combination of the symbols randomly selected by the game controller is displayed through a display window and, if the combination of symbols is a predetermined winning combination, a player is awarded a payout, wherein the mechanical symbol display unit includes a rotatable reel having a peripheral face with a plurality of symbols spaced apart peripherally thereon and being controllable to stop to display at least one of the symbols through the display window; an illuminating device provided within a space on an inner periphery side of the rotatable reel, being controllable to emit light of at least two different colors, including a first color and a second color different from the first color; and an illumination controller switching the illuminating device to emit light of the first color and the second color at a predetermined timing, wherein the symbols include a special symbol having at least two translucent portions, including a first translucent portion of the first color and a second translucent portion of the second color; whereby when the color of emitted light is determined selectively, the special symbol stopped in the display window is observable through the display window as a symbol in substantially the same single color as the determined color of emitted light or a symbol with a pattern of at least two colors, according to a combination of the determined color of emitted light and the colors of the at least two translucent portions. 
     Another aspect of the present invention is a method of controlling a gaming machine, which includes: a game controller and a mechanical symbol display unit, the mechanical symbol display unit including a rotatable reel having a peripheral face with a plurality of symbols spaced apart peripherally thereon; an illuminating device within a space on an inner periphery side of the rotatable reel; and an illumination controller, wherein the symbols include a special symbol having at least two translucent portions, including a first translucent portion of a first color and a second translucent portion of a second color different from the first color. The method includes the steps of: displaying a plurality of symbols in such a way that a combination of symbols randomly selected by the game controller is displayed through a display window by stopping the reel; awarding a payout to a player if the combination of symbols is a predetermined winning combination; emitting light of at least two different colors, including the first color and the second color; switching the illuminating device to emit light of the first color and the second color at a predetermined timing; and determining the color of emitted light selectively, so that the special symbol stopped in the display window is observable through the display window as a symbol in the same single color as the determined color of emitted light or a symbol with a pattern of at least two colors, according to a combination of the determined color of emitted light and the colors of the at least two translucent portions. 
     According to the above aspects of the present invention, it is possible for the display effects performed by the gaming machine with a simple structure to make games lively and easy for a player to grasp. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is an explanatory diagram of a functional flow of a gaming machine. 
         FIG. 2  is a perspective view of a gaming machine. 
         FIG. 3  is a perspective view of a reel device. 
         FIG. 4  is an exploded perspective view of a reel device. 
         FIG. 5  is a perspective view of a rotatable reel. 
         FIG. 6  is a perspective view of a reel frame and an illuminating device. 
         FIG. 7  is a front elevation of a reel frame and an illuminating device. 
         FIG. 8  is a perspective view of an illuminating device. 
         FIG. 9  is an electrical block diagram of a reel substrate. 
         FIG. 10  is an explanatory diagram of a data table showing symbols and code Nos. of each symbol. 
         FIG. 11  is an explanatory view of a special symbol. 
         FIG. 12  is an explanatory diagram of an example of a winning combination. 
         FIG. 13  is a flow chart of a base game process. 
         FIG. 14  is a flow chart of a special effect process. 
         FIG. 15  is a flow chart of a modification of the special effect process. 
         FIG. 16  is a flow chart of another modification of the special effect process. 
         FIG. 17  is a flow chart of a chance mode game process. 
         FIG. 18  is a flow chart of a payout process. 
     
    
    
     DETAILED DESCRIPTION 
     Embodiments of the invention may be implemented innumerous ways. A detailed description of embodiments is provided below along with accompanying figures. The detailed description is provided in connection with such embodiments, but is not limited to any particular embodiment. The scope is limited by the claims, but numerous alternatives, modifications, and equivalents are encompassed. Numerous specific details are set forth in the following description in order to provide a thorough understanding. These details are provided for the purpose of embodiment, and the descriptions provided may be used for implementation according the claims without some or all of these specific details. For the purpose of clarity, technical material that is known in the technical fields related to the embodiments has not been described in detail to avoid unnecessarily obscuring the description. 
     (Gaming Machine Overview) 
     A gaming machine  10  is described. The gaming machine  10  includes a reel device M 1  which includes: a rotatable reel M 3  having a reel band M 32  with a plurality of symbols  501  thereon; an illuminating device M 7  that is provided within a space on an inner periphery side of the rotatable reel M 3  and is controlled to emit light of at least two different colors; and an illumination controller. The symbols include a special symbol  510  having at least two translucent portions  511 ,  512 , each having a unique color that is the same as one of the at least two different colors. The at least two colors are selected in such a way that the special symbol  510  is observable as a symbol in one single color or a symbol with a pattern of at least two colors according to the color of the emitted light. 
     The “base game” in the embodiment is executed by the gaming machine  10 . The base game is a slot game where a plurality of symbols  501  are rearranged. Note that the base game is not limited to a slot game. The base game may be any type as long as it is independently executable by the gaming machine  10 . 
     Rearrangement of the symbols  501  in the slot game is executed on a reel device M 1  (symbol display device). The slot game includes processes of: executing a regular game on condition that a game value is bet, in which regular game the symbols  501  are rearranged on the reel device M 1 , and a regular payout according to the symbols  501  rearranged is awarded. 
     The symbols  501  include “special symbol  510 .” That is, the “symbols  501 ” is a superordinate concept of the special symbol  510 . The special symbol  510  in the embodiment corresponds to symbol “FLAME 7”. 
     The “game value” is a coin, paper money, or electronic value information corresponding to these. Note that the game value in the present invention is not particularly limited. Examples of the game value include game media such as medals, tokens, cyber money, tickets, and the like. A ticket is not particularly limited, and a barcoded ticket may be adopted for example. 
     The term “rearrange” in this specification means dismissing an arrangement of symbols  501  and arranging them once again. “Arrangement” means a state where the symbols  501  can be visibly confirmed by a player. 
     (Functional Flow of Gaming Machine) 
     The gaming machine  10  includes a bet button unit  601 , a spin button unit  602 , a display unit  614 , and a game controller  100  which controls these units. Note that the bet button unit  601  and the spin button unit  602  each are a kind of input device. Further, the gaming machine  10  includes a send-receive unit  652  which enables data communication with the external control device  621 . 
     The bet button unit  601  has a function of accepting a bet amount through player operation. The spin button unit  602  has a function of accepting a start of a game, such as a regular game, through player operation, that is, a start operation. The display unit  614  has functions 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. The display unit  614  has a symbol display region  614   a , and a video display region  614   b . The symbol display region  614   a  has a reel device M 1  and displays symbols  501 . The video display region  614   b  displays various types of effect video information to be displayed during a game, in the form of a moving image or a still image. 
     The game controller  100  includes: a coin insertion/start-check unit  603 ; a regular game executing unit  605 ; a random number extraction unit  615 ; a symbol determination unit  612 ; an effect-use random number extraction unit  616 ; an effect determination unit  613 ; a speaker unit  617 ; a lamp unit  618 ; a winning determination unit  619 ; and a payout unit  620 . 
     The regular game executing unit  605  has a function of executing a regular game on condition that the bet button unit  601  has been operated. 
     The symbol determination unit  612  has functions of: determining symbols  501  to be rearranged with a random number given from the random number extraction unit  615 ; rearranging the determined symbols  501  in the symbol display region  614   a  of the display unit  614 ; outputting information on rearrangement of the rearranged symbols  501  to the winning determination unit  619 ; outputting an effect designation signal to the effect-use random number extraction unit  616 , based on the rearrangement of the symbols  501 . 
     The effect-use random number extraction unit  616  has the following functions: when receiving the effect instruction signal from the symbol determination unit  612 , extracting an effect-use random number; and outputting the effect-use random number to the effect determination unit  613 . The effect determination unit  613  has functions of: determining an effect by using the effect-use random number; outputting video information on the determined effect in the video display region  614   b  of the display unit  614 ; outputting audio and illumination information on the determined effect to the speaker unit  617  and the lamp unit  618 , respectively. 
     The winning determination unit  619  has functions of: determining whether a winning is achieved when information on symbols  501  rearranged and displayed on the display unit  614  is given; calculating an amount of payout based on a winning combination 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 game value to a player in the form of a coin, a medal, a credit, or the like. 
     Further, the game controller  100  has a storage unit  661  which stores therein various types of bet amount data. The storage unit  661  is a device which rewritably stores data in a hard-disk device, memory, or the like. 
     Moreover, the gaming machine  10  has a reel control unit  631 . The reel control unit has a function of controlling the reel device M 1  to rearrange symbols  501  into a predetermined arrangement. 
     (Coin Insertion/Start-Check) 
     First, the gaming machine  10  checks whether the bet button unit  601  and the spin button unit  602  are sequentially pushed by a player in this order. 
     (Symbol Determination) 
     Next, when the player presses the spin button unit  602 , the gaming machine  10  extracts a random number for symbol determination. Then, for each rotatable reel M 3  displayed through the display unit  614 , the gaming machine  10  determines symbols  501  to be presented to the player when scrolling of symbol columns is stopped. 
     (Symbol Display) 
     Next, the gaming machine  10  starts scrolling a symbol column of each rotatable reel M 3 , and stops the scroll so that the symbols  501  determined are presented to the player. 
     (Winning Determination) 
     Next, when the symbol column of each rotatable reel M 3  stops scrolling, the gaming machine  10  determines whether a combination of the symbols  501  presented to the player is a winning combination. 
     (Payout) 
     Next, when a combination of the symbols  501  presented to the player is a winning combination, the gaming machine  10  awards the player a benefit according to the combination of the symbols  501 . 
     (Mechanical Structure of Gaming Machine) 
     Here, referring to  FIG. 2 , the overall structure of the gaming machine  10  is described. 
     The gaming machine  10  has a cabinet  11 , a top box  12  provided above of the cabinet  11 , and a main door  13  provided at the front face of the cabinet  11 . A reel device M 1  is provided within the main door  13 . A reel cover  134  is provided to the front of the reel device M 1 . Furthermore, the reel cover  134  includes a transparent liquid crystal panel or a transparent panel. The reel cover  134  may also include a touch penal. The reel cover  134  includes a display window at the center. It is possible to observe 20 (=5 columns×4 symbols) symbols  501  from the outside through the display window  150 . The four symbols  501  observed in each column are part of the symbols  501  arranged on the peripheral face of the rotatable reel M 3 . For each of the rotatable reels M 3 , all of the four symbols  501  change speed while moving upward or downward to be displayed. This enables rearrangement in a manner that symbols  501  are rotated and stopped thereafter. 
     (Reel Device M 1 ) 
     As shown in  FIGS. 3 &amp; 4 , the reel device M 1  provided in the gaming machine  10  has a reel unit M 11  which rearranges the symbols  501  by driving the rotatable reel M 3  on which symbols  501  are arranged, and a reel unit holding mechanism M 12  which holds the reel unit M 11  in a removable manner. In the following description, in order to specify the position of each reel unit M 11 , the first to fifth reel units M 11  from left to right, viewed from the front of the gaming machine  10 , are designated as M 11   a  to M 11   e.    
     (Reel Unit M 11 ) 
     As shown in  FIG. 3 , the reel unit holding mechanism M 12  holds the reel units M 11  in a removable manner. The reel unit M 11  includes a rotatable reel M 3  having symbols  501  arranged on the peripheral face and a reel support mechanism M 6  supporting the rotatable reel M 3 . 
     (Reel Unit M 11 : Rotatable Reel M 3 ) 
     As shown in  FIG. 5 , the rotatable reel M 3  includes a circular reel band M 32  having at least one symbol  501  arranged thereon and a reel frame M 31  having the reel band M 32  disposed on the peripheral face thereof. The reel band M 32  is formed of translucent material which is light-pervious, such as acrylic resin. The reel frame M 31  is formed of material which is light-pervious. 
     (Reel Unit M 11 : Illuminating Device M 7 ) 
     As shown in  FIGS. 6 &amp; 7 , an illuminating device M 7  is disposed within a space on an inner periphery side of the rotatable reel M 3 . The illuminating device M 7  emits light from the inner periphery side of the rotatable reel M 3  towards the reel band M 32  and is disposed in such a way that light through the reel band M 32  is observable from the outside of the gaming machine  10  through the display window  150 . 
     More particularly, as shown in  FIG. 8 , the illuminating device M 7  has four light source units M 70  arranged in the up and down direction. The light source units M 70  are arranged to face the symbols  501 ; that is, the positional relationships of the light source units M 70  and the symbols  501  are set to be in the radial direction of the rotatable reel M 3 . In this way, each of the light source units M 70  is capable of illuminating the corresponding symbol  501 , and it is possible for the emitted light to emit through the reel band M 32  and the transparent reel frame M 31 . 
     Each of the light source units M 70  is provided with a plurality of light sources M 71  arranged in the width direction and the lengthwise direction of the reel band M 32 . The light sources M 71  are able to change the light quantity of the emitted light to a plurality of levels. According to this feature, it is possible for the illuminating device M 7  to control the lighting mode of each of the light sources M 71  separately, thereby increasing the variety of illumination effects. 
     (Electrical Structure of Gaming Machine: Reel device M 1 ) 
     The circuit of the gaming machine  10  includes a main body PCB (Printed Circuit Board)  110  which is connected to a motherboard (not shown) including a main CPU (Central Processing Unit). The motherboard corresponds to the game controller  100  of the present embodiment. The reel device M 1  is connected to the main body PCB  110 . As shown in  FIG. 3 , the reel device M 1  has five reel units M 11 , the first to the fifth reel unit M 11   a  to M 11   e . As shown in  FIG. 9 , each of the first to the fifth reel units M 11   a  to M 11   e  has a reel substrate M 67 . The reel substrate M 67  has an in/out unit M 675  communicatably connected to the main body PCB  110 , a reel driving unit M 672  connected to the in/out unit M 675 , and an illumination driving unit M 673 . 
     The reel driving unit M 672  is connected to the reel motor M 51 , so as to supply driving power thereto. The illumination driving unit M 673  is connected to each light source M 71 , so as to supply driving power thereto separately. 
     (Symbols, Combinations, and the Like) 
     The symbols  501  displayed on the rotatable reels M 11   a  to M 11   e  of the gaming machine  10  form symbol columns. Each symbol  501  forming a symbol column is given any one of the code Nos. 0 to 21 or more, as shown in  FIG. 10 . Each symbol column has a combination of symbols  501  which are: “JACKPOT 7,” “FLAME 7,” “CHANCE CHERRY,” “WILD,” “BELL,” “CHERRY,” “STRAWBERRY,” “PLUM,” “ORANGE,” and “APPLE.” 
     Any four consecutive symbols  501  of a symbol column are displayed (arranged) in the uppermost tier, the upper tier, the lower tier, and the lowermost tier of the corresponding one of the rotatable reels M 11   a  to M 11   e , respectively, thereby forming a symbol matrix of five columns and four rows under the display window  150 . Scrolling of symbols  501  forming a symbol matrix starts when a game is started at least by pushing the start button  46 . The scrolling of the symbols  501  stops (rearrangement) after a predetermined period of time has elapsed since the scrolling began. 
     Further, various winning combinations are set beforehand for each symbol  501 . A winning combination is a combination of symbols  501  stopped on the payline, which puts a player into an advantageous state. Examples of the advantageous state include: when a predetermined number of coins corresponding to the winning combination are paid out; when the number of coins to be paid out is added to a credit amount; when a bonus game is started; and the like. 
     In the embodiment, a winning combination is a combination of symbols  501  which is formed on an activated payline and includes a predetermined number of at least one kind of the following symbols  501 : “FLAME 7,” “APPLE,” “PLUM,” “BELL,” “WILD,” and “CHERRY.”  FIG. 12  is an example of a winning combination. Note that the “WILD” symbol is a symbol  501  which can substitute for any other type of symbol  501 . 
     (Special Symbol  510 ) 
     The symbols  501  include a special symbol  510  having at least two translucent portions, including a first translucent portion  511  of a first color and a second translucent portion  512  of a second color. The first color and the second color are different and are selected in such a way that the special symbol  510  is observable as a symbol in one single color or a symbol with a pattern of at least two colors depending on the color of the emitted light. 
     In the embodiment, as shown in  FIG. 11 , the special symbol  510  is the symbol “FLAME 7.” The first color is red, and the second color is yellow. The first translucent portion  511  and the second translucent portion  512  form a flame pattern within the special symbol  510 . Thereby, when the illuminating device M 7  emits red light, the special symbol  510  is observed as a symbol in a single color which is red, and when the illuminating device M 7  emits yellow light, the symbol  510  is observed as a symbol with a flame pattern of two different colors, which are yellow and red. 
     (Base Game Processing) 
       FIG. 13  is a flowchart of the base game processing for the gaming machine  10  according to an embodiment of the present invention. 
     First, it is determined whether the credit, which is the number of the coins inserted by the player, still remains (step S 1 ). Specifically, the credit number C stored in the RAM is read out, and the process is performed on the basis of the credit number C. If the credit number C is “0” (step S 1 , NO), the game cannot be started, so the routine ends without any process performed. In the meantime, if the credit number C is greater than or equal to “1” (step S 1 , YES), it is determined that credit still remains, and the process proceeds to step S 2 . 
     In step S 2 , it is determined whether the spin button is pressed by the player. If the spin button is not pressed (step S 2 , NO), the step S 2  is performed repeatedly so as to standby until the spin button is pressed. Then, when the spin button is pressed (step S 2 , YES), a combination determination process is performed (step S 3 ). 
     In the combination determination process, the symbols  501  to be displayed through the display window  150  are determined on the basis of the random number generated by a random number generator. In the embodiment, the random number is generated by the random number generator provided outside the main CPU; however, the random number may also be generated by the arithmetic process of the main CPU without a random number generator being provided. 
     After performing the above combination determination process, each of the rotatable reels M 3  is rotated so as to rearrange the symbols  501  displayed in the display window  150  (step S 4 ). Then, after standby for a predetermined period (step S 5 ), each of the rotatable reels M 3  automatically stops rotating (step S 6 ). 
     Next, the process first checks whether the symbols  501  stopped in the display window  150  include the “CHANCE CHERRY” symbol (step S 61 ). If the “CHANCE CHERRY” symbol is displayed (step S 61 , YES), the process proceeds to step S 62 , in which a chance mode game is executed, and then proceeds to step S 7 . If not (step S 61 , NO), the process proceeds to step S 7  directly. 
     In step S 7 , according to the result of the combination determination process in step S 3  or step S 62 , it is determined whether the combination forms a winning combination. If the combination does not form a winning combination, the routine is terminated (step S 7 , NO). If the combination forms a winning combination (step S 7 , YES), the process further checks whether the winning combination formed includes a special symbol  510 , which is “FLAME 7” in the embodiment (step S 8 ). If there is no special symbol  510  in the winning combination (step S 8 , NO), the payout corresponding to the winning combination is awarded to the player (step S 9 ). On the other hand, if the winning combination includes a special symbol  510  (step S 8 , YES), a special effect is performed (step S 10 ) before proceeding to the payout process (step S 9 ). Note that the special effect corresponds to a flaming effect in the embodiment. Finally, the routine is terminated after the payout is awarded to the player. 
     (Chance Mode Game Processing) 
     As shown in  FIG. 13 , when the “CHANCE CHERRY” symbol stops in the display window  150  in the base game, the chance mode game is started (step S 62 ). The chance mode game is a “continuous game” in which a unit game is executed once or more than once. And in the chance mode game of the embodiment, the probability of forming a winning combination contributed by the symbol “WILD” or “FLAME 7,” which corresponds to relatively more payouts, is higher than that in the base game. Referring to  FIG. 17 , when entering the chance mode game, a counter N is initialized to 0 at first (step S 401 ). The counter N stores the number of times that the unit game has been executed in the chance mode game. Next, the appearance probabilities of the symbols  501  are set to predetermined values corresponding to the counter N (step S 402 ). More particularly, the appearance probabilities of the symbols “WILD” and “FLAME 7” are set to higher values than those in the base game when the value of the counter N is 0, e.g. the first unit game in the chance mode game. In the meantime, the appearance probability of the “CHERRY” symbol is set to 0. And when the counter N is greater than 0, the appearance probabilities of the specific symbols “CHERRY,” “WILD,” and “FLAME 7” are set to higher values than those in the previous unit game. Accordingly, the appearance probabilities of the specific symbols “CHERRY,” “WILD,” and “FLAME 7” become increasingly higher as the chance mode game continues. 
     Next, in step S 403  to S 407 , symbols are rearranged in the same manner as step S 3  to S 6  of the base game process. After the rearrangement, the process proceeds to step S 408 , in which it is determined whether the combination displayed is one of the specific winning combinations which terminate the chance mode game. In the embodiment, the specific winning combinations are winning combinations including at least one “CHERRY” symbol, at least three “WILD” symbols, or at least three “FLAME 7” symbols. For example, if the combination displayed includes four “FLAME 7” symbols, which is a specific winning combination, the chance mode game is terminated (step S 408 , YES). On the other hand, if the combination displayed is not a specific winning combination (step S 408 , NO), the counter N is increased by 1 (step S 409 ), and then the process goes back to step S 402  to reset the appearance probabilities of the symbols, and the unit game is repeated. In the embodiment, when the counter N is 7, i.e. the eighth unit game, the appearance probabilities of the symbols  501  are set in such a way that the combination determined in step S 403  will definitely be a specific winning combination. That is, the chance mode game will terminate in the eighth unit game. 
     According to the process described above, the winning combinations corresponding to more payouts are formed more easily in the chance mode game than in the base game. And the probability of forming the specific winning combination becomes higher each time the unit game is repeated. The chance mode game is a “continuous game” which is constituted by 1 to 8 unit games and is terminated when a specific winning combination is formed. Note that the specific winning combination is definitely formed in the eighth unit game. 
     (Payout Processing) 
     In some embodiments, the payout is multiplied by a payout multiplying factor according to the number of “WILD” symbols arranged in the winning combination. As shown in  FIG. 18 , first, the payout is determined according to the winning combination (step S 501 ). Next, a check is performed as to whether the number of “WILD” symbols arranged in the winning combination is greater than or equal to a predetermined number, which is “2” in the embodiment (step S 502 ). If the number of “WILD” symbols in the winning combination is less than “2” (step S 502 , NO), the process proceeds to step S 506 . On the other hand, if the number of the “WILD” symbols in the winning combination is greater than or equal to “2” (step S 502 , YES), the process proceeds to step S 503 . In step S 503 , a further check is performed as to whether the symbols  501  which contribute to the winning combination include only the “WILD” symbols; if this is the case, the payout will not be multiplied (step S 503 , YES). For example, if there are 5 “WILD” symbols arranged in the winning combination, which means no other type of symbol contributes to the winning combination, the payout remains a fixed payout set in step S 501 . Note that the payout corresponding to the winning combination of 5 “WILD” symbols is the top payout in the embodiment. If the symbols  501  which contribute to the winning combination include other types of symbols than the “WILD” symbols, the payout will be multiplied by a payout multiplying factor (step S 503 , NO). 
     In step S 504 , the payout multiplying factor is determined based on the number of “WILD” symbols arranged in the winning combination. In the embodiment, the payout multiplying factor is set to the number of “WILD” symbols arranged in the winning combination. For example, if there are 2 “WILD” symbols arranged in the winning combination, the payout multiplying factor is set to “2,” and if there are 3 “WILD” symbols, the payout multiplying factor is set to “3.” In step S 505 , the payout is multiplied by the payout multiplying factor determined in step S 504 . According to the above processes, the payout is multiplied by the number of “WILD” symbols. That is, the payout is doubled when there are 2 “WILD” symbols and is tripled when there are 3 “WILD” symbols arranged in the winning combination. At the end of the payout process, the payout is awarded to the player (step S 506 ). 
     According to the payout processing of the embodiment described above, when a winning combination is displayed on an activated payline, a predetermined fixed payout amount corresponding to the winning combination is related to the winning combination, and the fixed payout amount is multiplied according to the number of “WILD” symbols within the symbols  501  forming the winning combination, and the final payout amount is determined by calculation. 
     For example, when a winning combination of 5 “CHERRY” symbols is displayed, the payout amount is 60. But if there are 2 “CHERRY” symbols substituted by the “WILD” symbols, the payout amount becomes 120. Moreover, in the chance mode game of the embodiment described above, the appearance probability of the “WILD” symbol differs from that in the base game. That is, the probability of winning a higher payout amount when the winning combination is formed in the chance mode game is also increased. 
     According to the embodiment described above, a gaming machine described below is provided. 
     The gaming machine comprises a symbol display unit displaying a plurality of symbols including “WILD” symbols that substitute as symbols contributing to a winning combination, program data for executing a game with data controlling an appearance probability of the symbols, a memory device storing various kinds of data, including data for determining a fixed payout amount according to the number of symbols contributing to the winning combination and the “WILD” symbols displayed on a certain payline and data for multiplying the fixed payout amount according to the number of “WILD” symbols existing within the plurality of symbols contributing to the winning combination, and a CPU executing a “continuous game” that reads out the various kinds of data stored in the memory device, executes a regular game on the basis of the various kinds of data read out, and executes a game which sets the appearance probability of the specific symbols to a higher value according to the game result of the regular game. The CPU determines whether the number of symbols contributing to a winning combination and the “WILD” symbols form a winning combination. If a winning combination is formed, the gaming machine extracts a multiple corresponding to the number of “WILD” symbol within the symbols contributing to the winning combination, and data of a fixed payout amount predetermined for each winning combination respectively. The gaming machine awards a payout of an amount calculated by multiplying the fixed payout amount extracted from the memory device by the multiple extracted from the same memory device. 
     (Reel Effect by Illuminating Device M 7 ) 
     The gaming machine  10  of the embodiment is configured in a way that the plurality of light sources M 71  in the illuminating device M 7  are separately controllable. 
     Specifically, the gaming machine  10  has a rotatable reel M 3  having a transparent reel band M 32  and symbols  501  being arranged on the reel band M 32 , a reel driving mechanism M 5  for rearranging the symbols  501  by driving the rotatable reel M 3 , an illuminating device M 7  disposed in a way that the emitted light through the reel band M 32  is observable from the outside, and an illumination controller controlling the lighting mode (light quantity, color, emitting interval, emitting timing, and the like) of the emitted light which is emitted from the illuminating device M 7 . The illuminating device M 7  has a plurality of light sources M 71  being arranged in the width and the lengthwise direction of the reel band M 32  and being controllable to change the light quantity of the emitted light to a plurality of levels. More particularly, the light sources M 71  are LEDs (Light Emitting Diodes) arranged as a matrix in the embodiment. The illumination controller is capable of controlling the plurality of light sources M 71  separately. 
     Specifically, the illumination controller controls the plurality of light sources M 71  in such a way that the light quantity (or brightness level) is increased or decreased sequentially in the rotation direction or the reverse direction of the rotatable reel M 3 . 
     The light sources M 71  are also controlled in such a way that the color of the emitted light is changed sequentially in the rotation direction or the reverse direction of the rotatable reel M 3 . 
     The light sources M 71  are also controlled in such a way that the speed of changing the color (or brightness level) sequentially is set in accordance with the rotation speed of the rotatable reel M 3 . 
     (Special Effect Processing) 
     As shown in  FIG. 13 , when the symbols  501  stopped in the display window  150  form a winning combination which includes a special symbol  510 , the special effect is performed. In the embodiment, the illuminating device M 7  starts emitting white light when the reel rotation is started. Then, in the special effect process, as shown in  FIG. 14 , the illuminating device M 7  changes the color of the emitted light to yellow (step S 101 ), which is the same color as the second portion of the special symbol  510  “FLAME 7.” At this point, a flame pattern including red and yellow portions is observed within the special symbol  510  “FLAME 7.” 
     Next, the counter N stored in the RAM is set to a predetermined number of times to repeat the effect (step S 102 ). Then, in step S 103 , the brightness level of the emitted light is increased from an original level to a predetermined higher level sequentially in the rotation direction of the rotatable reel M 3  with a predetermined interval. More particularly, the brightness levels of the emitted light emitted from the uppermost row of the light sources M 71  are first increased, and the brightness level of the next row of the light sources M 71  is then increased after a predetermined interval. The brightness level variation of the following rows of the light sources M 71  are manipulated in the same way. Accordingly, the brightness level of the emitted light is increased from the upper side to the lower side dynamically. 
     Next, the brightness levels of all light sources M 71  are reset to the original level (step S 104 ). Then, the counter N stored in the RAM is decreased by 1 (step S 105 ) and the process proceeds to step S 106 . 
     In step S 106 , it is determined whether the counter N is greater than “0.” If the counter N is greater than “0” (step S 106 , YES), the process goes back to step S 103  so as to repeat the dynamic brightness level variation effect. If the counter N is not greater than “0” (step S 106 , NO), then the process proceeds to step S 107 . 
     According to the above illumination effect, a flaming effect is performed within the special symbol  510  “FLAME 7.” 
     In step S 107 , all of the light sources M 71  emit red light, so that the special symbol  510  “FLAME 7” is observed as a symbol in a single color, which is red in the embodiment. Specifically, the first translucent portion  511  of the first color, which is red in the embodiment, still appears to be red, while the second translucent portion  512  of the second color, which is yellow in the embodiment, appears to be red with the red emitted light. 
     Accordingly, at the end of the special effect process, all of the special symbols  510  “FLAME 7” in the winning combination appear to be in red, so that the winning combination is easily recognized by the player. 
     Modification 1 
     In the above embodiment, the special effect is carried out by performing the dynamic brightness level variation effect. However, the present invention is not limited to this.  FIG. 15  is a flowchart of a modification of the special effect processing. 
     First, in step S 201 , the counter N stored in the RAM is set to a predetermined number of times to repeat the effect. Next, the color of the emitted light is changed to yellow (step S 202 ). At this point, the special symbol  510  “FLAME 7” is observed as a symbol with a flame pattern of two different colors, which are red and yellow. 
     Then, after a predetermined elapsed time, the color of the emitted light is changed to red (step S 203 ), so that the special symbol  510  “FLAME 7” is observed as a symbol in a single color, which is red. 
     Next, the counter N is decreased by 1 (step S 204 ). After that, it is determined whether the counter N is greater than “0” (step S 205 ). If the counter N is greater than “0” (step S 205 , YES), the process goes back to step S 202  to repeat the effect. If the counter N is not greater than “0” (step S 205 , NO), the special effect process is terminated. 
     According to the above process, by switching the color of the emitted light between yellow and red repeatedly, the flame pattern in the special symbol  510  appears and disappears alternatively, so that a dynamic flaming effect is performed within the special symbol  510  “FLAME 7.” 
     Modification 2 
     Further, another modification of the special effect processing is also provided. The dynamic brightness level variation effect in the above embodiment is modified to a dynamic color variation effect, in which the color of the emitted light of the light sources M 71  is changed sequentially in the rotation direction, instead of increasing the brightness level. 
     As shown in  FIG. 16 , in step S 301 , the counter N stored in the RAM is set to a predetermined number of times to repeat the effect. 
     Then, in step S 302 , the color of the emitted light is switched from white to yellow sequentially in the rotation direction of the rotatable reel M 3  with a predetermined interval. More particularly, the color of the emitted light emitted from the uppermost row of the light sources M 71  is first changed, and the color of the next row of the light sources M 71  is then changed after a predetermined interval. The color switching of the following rows of the light sources M 71  is manipulated in the same way. Accordingly, the color of the emitted light is changed from the upper side to the lower side dynamically. 
     Next, the counter N is decreased by 1 (step S 303 ). After that, it is determined whether the counter N is greater than “0” (step S 304 ). If the counter N is greater than “0” (step S 304 , YES), the color of the emitted light of all light sources M 71  is reset to white (step S 309 ), and then the process goes back to step S 302  to repeat the effect. If the counter N is not greater than “0” (step S 304 , NO), the process proceeds to step S 305 , in which the counter N is reset to the predetermined number of times to repeat the effect. 
     Next, in step S 306 , an effect similar to that in step S 302  is performed. The only difference is that the color of the emitted light changes from yellow to red, instead of changing from white to yellow. 
     Then, the counter N is decreased by 1 (step S 307 ). After that, it is determined whether the counter N is greater than “0” (step S 308 ). If the counter N is greater than “0” (step S 308 , YES), the color of the emitted light of all light sources M 71  are reset to yellow (step S 310 ), and then the process goes back to step S 306  to repeat the effect. If the counter N is not greater than “0” (step S 308 , NO), the special effect process is terminated. 
     According to the above process, an dynamic flaming effect is produced. 
     The above embodiment thus described solely serves as a specific example of the present invention, and the present invention is not limited to such an example. Specific structures and various means may be suitably designed or modified. Further, the effects of the present invention described in the above embodiment are not more than examples of most preferable effects achievable by the present invention. The effects of the present invention are not limited to those described in the embodiments described above. For example, effect procedures, colors of emitted light or the like mentioned in the present embodiment and modifications 1 and 2 are no more than examples Further, the detailed description above mainly focuses on characteristics of the present invention to facilitate understanding. The present invention is not limited to the above embodiments, and is applicable to a 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 other structures, systems, methods or the like are possible, within the spirit of the invention described in the present specification. The description of claims therefore shall encompass structures equivalent to the present invention, unless such structures are regarded as departing from the spirit and scope of the present invention. Further, the abstract is provided to allow, through simple investigation, quick analysis of the technical features and essence of the present invention by an intellectual property office, a general public institution, or one skilled in the art who is not fully familiar 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 documents already 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 one skilled in the art to most efficiently understand the present invention. A process executed 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. Although the present specification occasionally personifies the processes executed 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. 
     LIST OF REFERENCE NUMERALS 
     
         
         
           
               10  Gaming machine 
               150  Display window 
               501  Symbol 
               510  Special Symbol 
               511  First translucent portion 
               512  Second translucent portion 
             M 1  Reel device 
             M 3  Rotatable Reel 
             M 5  Reel driving mechanism 
             M 6  Reel support mechanism 
             M 7  Illuminating device 
             M 11  Reel unit 
             M 11   a ˜M 11   e  First˜Fifth reel unit 
             M 12  Reel unit holding mechanism 
             M 31  Reel frame 
             M 32  Reel band 
             M 51  Reel motor 
             M 70  Light source unit 
             M 71  Light source