Abstract:
A game apparatus comprises operation accepting means that accepts a bet by a player on a betting target among a plurality of betting targets for each of which odds indicating a winning allotment in a first game are set; drawing means that conducts a drawing for the first game; allotment means that pays out a game medium in accordance with a drawing result of the drawing means; storage means that holds a set payout ratio targeted by the game apparatus; stake calculation means that calculates a stake for a second game whose payout ratio is 1, taking into account, along with a number of bet game media, a difference between a position payout ratio, which serves as a winning allotment expectation value per unit of game media, for the betting target bet on by the player, and a set payout ratio held by the storage means; stake accumulation means that accumulates a stake calculated by the stake calculation means; and second game execution means that, if a predetermined condition is satisfied, executes the second game based on a stake accumulated in the stake accumulation means.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is the U.S. national phase of the International Patent Application No. PCT/JP2012/071102 filed Aug. 21, 2012, which claims the benefit of Japanese Patent Application No. 2011-190917 filed Sep. 1, 2011, the entire content of which is incorporated herein by reference. 
     
    
     FIELD 
       [0002]    The invention relates to a method of controlling a game apparatus. 
       BACKGROUND 
       [0003]    A game apparatus is known regarding which odds (a magnification as to in what multiples game media, such as bet medals, return as a winning allotment) are set for each of a plurality of betting targets, as in a dice game, etc. (see Patent Documents 1, 2, etc.). Patent Document 1 discloses that odds ranging from 1:1 to 180:1 are set for each of a plurality of betting targets according to the appearance probability of a betting target. 
         [0004]    In the above-described game apparatus, the total number of game media paid back via allotment with respect to the total number of game media bet by a player is controlled as a payout (PO) ratio. An installer for game apparatuses specifies a payout ratio (set payout ratio) for each game apparatus or for each business, and sets the odds, etc., such that an actual payout ratio approaches a set payout ratio. 
       SUMMARY 
       [0005]    In the case of a dice game using three dice, such game involves approximately 30 betting targets, which cover: a total value of the rolled numbers of the three dice; a rolled number of any of the three dice; and the same rolled numbers among the three dice. Thus, it has been troublesome for an operator to set the odds for all of the betting targets for each game apparatus. 
         [0006]    Further, a player can expect the set payout ratio for an entire game apparatus in accordance with the odds sets for each betting target, and thus, a comparison can easily be made regarding the businesses which have good/poor allotments. This has been a problem from the viewpoint of attracting customers. 
         [0007]    The invention has been proposed in light of the above-described conventional problems, and an object is to provide a game apparatus capable of having an actual payout ratio converge to a set payout ratio while fixing odds for a plurality of betting targets. 
         [0008]    According to an embodiment, a game apparatus comprises: operation accepting means that accepts a bet by a player on a betting target among a plurality of betting targets for each of which odds indicating a winning allotment in a first game are set; drawing means that conducts a drawing for the first game; allotment means that pays out a game medium in accordance with a drawing result of the drawing means; storage means that holds a set payout ratio targeted by the game apparatus; stake calculation means that calculates a stake for a second game whose payout ratio is 1, taking into account, along with a number of bet game media, a difference between a position payout ratio, which serves as a winning allotment expectation value per unit of game media, for the betting target bet on by the player, and a set payout ratio held by the storage means; stake accumulation means that accumulates a stake calculated by the stake calculation means; and second game execution means that, if a predetermined condition is satisfied, executes the second game based on a stake accumulated in the stake accumulation means. 
         [0009]    According to another embodiment, a computer readable recording medium has an executable program recorded therein which causes a computer configuring a game apparatus to implement: operation accepting means that accepts a bet by a player on a betting target among a plurality of betting targets for each of which odds indicating a winning allotment in a first game are set; drawing means that conducts a drawing for the first game; allotment means that pays out a game medium in accordance with a drawing result of the drawing means; storage means that holds a set payout ratio targeted by the game apparatus; stake calculation means that calculates a stake for a second game whose payout ratio is 1, taking into account, along with a number of bet game media, a difference between a position payout ratio, which serves as a winning allotment expectation value per unit of game media, for the betting target bet on by the player, and a set payout ratio held by the storage means; stake accumulation means that accumulates a stake calculated by the stake calculation means; and second game execution means that, if a predetermined condition is satisfied, executes the second game based on a stake accumulated in the stake accumulation means. 
         [0010]    With the game apparatus according to embodiments of the invention, an actual payout ratio can be made to converge to a set payout ratio while odds for a plurality of betting targets are fixed, whereby the setting operations to be performed by an operator can be reduced, and further, a comparison can be prevented from being made by a player regarding the businesses which have good/poor allotments. 
         [0011]    Further, a sub game executed concurrently with a main game can improve the enjoyability of the game, which keeps a player from becoming bored and through which longer game play can be expected. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0012]    Other objects, features and advantages of the invention will become more apparent by reading the following detailed descriptions with reference to the attached drawings. 
           [0013]      FIG. 1  is an outside perspective view of a game apparatus according to an embodiment of the invention. 
           [0014]      FIG. 2  is a block diagram illustrating a configuration example of a control system of the game apparatus according to an embodiment of the invention. 
           [0015]      FIG. 3A  is a diagram illustrating an example of control data according to an embodiment of the invention. 
           [0016]      FIG. 3B  is another diagram illustrating an example of control data according to an embodiment of the invention. 
           [0017]      FIG. 3C  is another diagram illustrating an example of control data according to an embodiment of the invention. 
           [0018]      FIG. 3D  is another diagram illustrating an example of control data according to an embodiment of the invention. 
           [0019]      FIG. 3E  is another diagram illustrating an example of control data according to an embodiment of the invention. 
           [0020]      FIG. 4  is a flowchart illustrating a process example of the embodiment of the invention. 
           [0021]      FIG. 5  is a diagram illustrating an example of a display screen of a game table display according to an embodiment of the invention. 
           [0022]      FIG. 6  is a diagram illustrating another example of a display screen of the game table display according to an embodiment of the invention. 
           [0023]      FIG. 7  is a diagram illustrating another example of a display screen of the game table display according to an embodiment of the invention. 
           [0024]      FIG. 8  is a diagram illustrating another example of a display screen of the game table display according to an embodiment of the invention. 
           [0025]      FIG. 9  is a diagram illustrating another example of a display screen of the game table display according to an embodiment of the invention. 
           [0026]      FIG. 10  is a diagram illustrating another example of a display screen of the game table display according to an embodiment of the invention. 
           [0027]      FIG. 11  is a diagram illustrating another example of a display screen of the game table display according to an embodiment of the invention. 
           [0028]      FIG. 12  is a diagram illustrating another example of a display screen of the game table display according to an embodiment of the invention. 
           [0029]      FIG. 13  is a diagram illustrating another example of a display screen of the game table display according to an embodiment of the invention. 
           [0030]      FIG. 14  is a diagram illustrating another example of a display screen of the game table display according to an embodiment of the invention. 
           [0031]      FIG. 15  is a diagram illustrating another example of a display screen of the game table display according to an embodiment of the invention. 
       
    
    
     DETAILED DESCRIPTION 
       [0032]    Preferred embodiments of the invention will hereinafter be described. 
         [0033]      FIG. 1  is an outside perspective view of a game apparatus  1  according to an embodiment of the invention. The game apparatus  1  will be described with the premise that a dice game, as a main game, and a bingo game, as a sub game, are employed; other games may also be applied as main and sub games. 
         [0034]    In  FIG. 1 , the game apparatus  1  is constituted by a front-side operation casing  2  and a back-side dice upward-blowing casing  10 . The dice upward-blowing casing  10  is provided with three upward-blowing pipes  16  located side by side. 
         [0035]    In the game apparatus  16 , a vertically long game table display  3  is provided on an upper surface of the operation casing  2 . Four operation tables  4  are provided, protruding above an upper edge of the operation casing  2 , so as to surround the game table display  3 . 
         [0036]    The operation tables  4  are respectively provided with: operators  5  each consisting of a lever and a plurality of buttons; and medal slots  6  into which medals are inserted. Operation table speakers  7  that emit sounds toward players for the operation tables  4  are respectively provided on upper surfaces of the operation tables  4 . Further, medal outlets  9  that discharge medals from a metal discharge hopper  8 , which is provided inside the operation casing  2 , are provided below the operation tables  4 , on either side surface of the operation casing  2 . 
         [0037]    The dice upward-blowing casing  10  is provided connected to the operation casing  2 . The dice arranged inside the three upward-blowing pipes  16  are upward blown, from below and via air streams, and are then dropped, and the rolled numbers of such dice are then detected. 
         [0038]    The dice upward-blowing casing  10  has a vertically long shape, and a ceiling  12  supported by columns  11  on both sides of the dice upward-blowing casing  10  is shaped such that each of a front surface and a back surface thereof is inclined downward. A history display  13 , as a horizontally long liquid crystal display, is provided at the center of the ceiling  12 , and upward-blowing casing speakers  14  are provided on both sides of the history display  13 . 
         [0039]    A horizontal base  15  is provided at the level of the midpoint of the dice upward-blowing casing  10 , and this base  15  is mounted, at a left position A, a center position B, and a right position C, with the three transparent upward-blowing pipes  16 , with respect to the ceiling  12 . 
         [0040]    A player can observe the state of the dice blown up and then dropped inside the upward-blowing pipes  16  and can also play a game, via operating the operator  5  of the operation table  4 , by predicting the rolled numbers of the dice while viewing a game field  20  displayed on the game table display  3 . 
         [0041]      FIG. 2  is a block diagram illustrating a configuration example of a control system of the game apparatus  1 . 
         [0042]    Referring to  FIG. 2 , the game apparatus  1  is provided with a control unit  50 , the game table display  3 , the operators  5 , a medal detector  6   a , the operation table speakers  7 , the medal discharge hoppers  8 , the history display  13 , the upward-blowing casing speakers  14 , a stepping motor  35 , a DC axial-flow fan  36 , a camera  46  and an infrared LED  47 . The game table display  3 , the operators  5 , the operation table speakers  7 , the medal discharge hopper  8 , the history display  13  and the upward-blowing casing speakers  14  are shown in  FIG. 1 . The medal detector  6   a  detects the insertion of medals into the medal slot  6  and the number of inserted medals. 
         [0043]    The stepping motor  35  is used to open/close a shutter of an air intake located below each of the upward-blowing pipes  16 . 
         [0044]    The DC axial-flow fan  36  is used to generate air streams via the shutter of the air intake located below the upward-blowing pipe  16 . 
         [0045]    The camera  46  is used to photograph the motion of the dice from below in the upward-blowing pipes  16 . Rolled numbers are detected from the photographed images of the rolled numbers of the dice that have dropped into the lower parts of the upward-blowing pipes  16 , and the rolled numbers on the upper surfaces of such dice can be detected according to a rule whereby the sum of the rolled numbers of opposing surfaces of a dice is “7.” 
         [0046]    The infrared LED is used to illuminate dice so that they can be photographed by the camera  46 . 
         [0047]    The control unit  50  comprises a CPU (Central Processing Unit), memories (RAM (Random Access Memory) and ROM (Read Only Memory)), etc. The control unit  50  includes a storage unit  60  and achieves various functions by executing a game program  61  stored in the storage unit  60  so as to control the entire game apparatus  1 . For example, the game program  61  may be recorded in a hard disk device (HDD) (recording medium) in the storage unit  60 . Examples of such functions attained by the control unit  50  include a main game controller  51 , a sub game controller  52 , an upward-blowing controller  53 , a rolled-number detection processor  54 , a display controller  55  and a sound controller  56 . The storage unit  60  stores the game program  61 , control data  62 , etc. 
         [0048]    The main game controller  51  is a part that controls a dice game serving as a main game. 
         [0049]    The sub game controller  52  is a part that controls a bingo game serving as a sub game. 
         [0050]    The upward-blowing controller  53 , being a part that controls the upward blowing of the dice, controls the stepping motor  35 , the DC axial-flow fan  36 , etc. 
         [0051]    The rolled-number detection processor  54 , being a part that detects the rolled numbers of the dice, controls the camera  46 , the infrared LED  47 , etc. 
         [0052]    The display controller  55  controls the game table display  3 , the history display  13 , etc. 
         [0053]    The sound controller  56  controls the operation table speakers  7 , the upward-blowing casing speakers  14 , etc. 
         [0054]      FIGS. 3A ,  3 B,  3 C,  3 D and  3 E are diagrams illustrating examples of the control data  62  held in the storage unit  60 . 
         [0055]    Referring to  FIG. 3A , the control data  62  contains data common to all players and data for each player. 
         [0056]    As to data common to all players, the control data  62  contains a set payout ratio  101 , a betting time  102 , a winning probability  103  for each betting target, odds  104  for each betting target, a position payout ratio  105  for each betting target, a jackpot allotment magnification  106 , a bet stake-share-ratio  107 , an allotment stake-share-ratio  108 , a maximum scale value  109  for each grade, initial and maximum jackpot values  110  for each grade and a sub game winning value rate  111 . 
         [0057]    As to data for each player, the control data  62  contains a number of bets  121 , betting targets  122 , winning betting targets  123 , a sub game startup point  124 , a present scale value  125 , a present grade  126 , a jackpot value  127  for each grade, sub game status data  128  and sub game result data  129 . 
         [0058]    The meanings of such respective data pieces are described below. 
         [0059]    The set payout ratio  101  refers to a payout ratio targeted by the game apparatus  1 . “0.9 (90%)” is set, by way of example. 
         [0060]    The betting time  102  refers to a time during which bets are accepted from the start of a new game, in a dice game serving as a main game. “50 s” is set, by way of example. 
         [0061]    Referring to  FIG. 3B , the winning probability  103  for each betting target refers to a winning probability corresponding to a betting target (e.g., “4,” “5,” “6,” “7,” “8,” “9,” “10,” “11,” “12,” “13,” “14,” “15,” “16,” or “17” as the total of the rolled numbers of three dice; “Low” ranging from 3 to 10 as the total of the rolled numbers of three dice; “High” ranging from 11 to 18; “1,” “2,” “3,” “4,” “5,” or “6” as one of the rolled numbers of the three dice; or “1,” “2,” “3,” “4,” “5,” or “6” as the same rolled number shared by all three of the dice). A winning probability is obtained by dividing the number of winning events for a betting target by the number all of the events (the number of all of the combinations of rolled numbers for three dice is 6 3 =216), and thus, such winning probability may be obtained by calculation each time, or the relevant table may be made to be retained in advance. 
         [0062]    Referring to  FIG. 3B , the odds  104  for each betting target refer to odds corresponding to a betting target (a magnification as to in what multiples game media, such as bet medals, return as a winning allotment), and have a fixed round-number value settled as determined in advance by a designer in consideration of a winning probability and a set payout ratio. Therefore, an operator of the game apparatus  1  does not need to change such odds. In principle, odds are set such that a position payout ratio has a value lower than that of a set payout ratio. Further, in the example shown in the figure, regarding the betting target “Low,” odds are set for each of: the case in which the total of the rolled numbers of the three dice ranges from 3 to 9; and the case in which such total is 10, and either of such odds is applied according to a drawing result. Similarly, regarding the betting target “High,” odds are set for each of: the case in which the total of the rolled numbers of the three dice is 11; and the case in which such total ranges from 12 to 18, and either of such odds is applied according to a drawing result. 
         [0063]    Referring to  FIG. 3B , the position payout ratio  105  for each betting target refers to an allotment expectation value per unit number of game media such as medals (for example, one medal) when a betting target wins, and is obtained by multiplying a winning probability by the odds. The position payout ratio  105  may be calculated each time, or the relevant table may be made to be retained in advance. In the illustrated example, multiple winning probabilities and multiple odds are set for each of the betting targets “Low” and “High,” and thus, a position payout ratio is calculated by performing an addition of the respective products of such winning probabilities and such odds regarding the respective patterns. That is, regarding the betting target “Low,” 
         [0064]    0.46%×2+37.04%×2+12.50%×1=87.50% is obtained, and regarding the betting target “High,” 
         [0065]    12.50%×1+37.04%×2+0.46%×2=87.50% is obtained. 
         [0066]    The jackpot allotment magnification  106  refers to a magnification as to in what multiples the number of game media, such as medals, serving as a stake, are provided as an allotment when a jackpot (big win) occurs in a bingo game serving as a sub game. “10” is set, by way of example. 
         [0067]    The bet stake-share-ratio  107  refers to a share ratio with respect to a bingo game serving as a sub game when, bets are made in a dice game serving as a main game, a stake proportional to the difference between a set payout ratio and a position payout ratio is collected. “0.5” is set, by way of example. 
         [0068]    The allotment stake-share-ratio  108  refers to a share ratio with respect to a bingo game serving as a sub game when, an allotment is provided in a dice game serving as a main game, a stake proportional to the difference between a set payout ratio and a position payout ratio is collected. “0.5” is set, by way of example. The sum of the bet stake-share-ratio  107  and the allotment stake-share-ratio  108  is assumed to be “1.0.” 
         [0069]    Referring to  FIG. 3C , the maximum scale value  109  for each grade refers to the maximum scale value corresponding to each of the grades of a grade meter that shows a stake accumulation state of a bingo game serving as a sub game. The grade meter&#39;s grades consist of, for example, four divisions: “MINI,” “BIG,” “MEGA” and “PARADiCE” in order, starting from the lowest. In the initial state, the scale value of the lowest grade “MINI” is full, and the present grade is “MINI.” When stake sharing is performed, the length of the gauge (bar) extends with the increase of the scale value in the next grade, “BIG.” Then, when the scale value reaches the maximum “100” corresponding to the “BIG” grade, the present grade then becomes “BIG.” Similarly, grade changes up to the highest grade of “PARADiCE” can be effected in accordance with the increase in the scale value. 
         [0070]    Referring to  FIG. 3D , the initial and maximum jackpot values  110  for each grade refer to initial and maximum jackpot values corresponding to each of the grades of a grade meter. 
         [0071]    Referring to  FIG. 3E , the sub game winning value rate  111  refers to a rate for a winning value of a bingo game serving as a sub game, and specifies a magnification with respect to the jackpot (JP) value of the present grade, in accordance with the number of winning lines attained in a bingo game. When all of the lines win (in the case of a bingo game with 3×3=9 squares, this means that eight lines win), a jackpot occurs, and an allotment is provided based on the jackpot value itself. A smaller number of winning lines results in a smaller allotment. 
         [0072]    The number of bets  121  refers to the number of game media, such as medals, bet by a relevant player on the betting targets  122  in a dice game serving as a main game. 
         [0073]    The betting targets  122  refer to betting targets bet on by a relevant player in a dice game serving as a main game and comprise data held based on a determination made by the main game controller  51  in accordance with signals from the operator  5 . 
         [0074]    The winning betting targets  123  refer to betting targets that win as a result of a drawing in a dice game serving as a main game and comprise data held based on a determination made by the main game controller  51  as to the rolled numbers of dice. 
         [0075]    The sub game startup point  124  refers to data for determining a start of a bingo game serving as a sub game. For example, the sub game startup point  124  starts to be reduced from the initial value “100,” and a bingo game is started when “0” is reached. The process of controlling the value of the sub game startup point  124  will be described below. 
         [0076]    The present scale value  125  refers to the scale value, as of a present moment, of a grade meter. The process of controlling the value of the present scale value  125  will be described below. 
         [0077]    The present grade  126  refers to the grade, as of a present moment, of a grade meter. The initial value is “MINI.” The process of controlling the value of the present grade  126  will be described below. 
         [0078]    The jackpot value  127  for each grade refers to a jackpot value set for each of the grades of a grade meter. The process of controlling the value of the jackpot value  127  for each grade will be described below. 
         [0079]    The sub game status data  128  refers to data showing the state of a bingo game managed by the sub game controller  52 , and contains: data on the rolled numbers of a die randomly assigned to each of the squares (e.g., 3×3=9 squares) (for each square, either one rolled number may be employed, or multiple rolled numbers—regarding which it is sufficient for any one of such numbers to produce a match—may be employed); and data indicating that any of the squares has become a line component for a win (in general, an “occupied” or “open” state) due to the match of the rolled number of such square with a rolled number in a dice game serving as a main game. 
         [0080]    The sub game result data  129  refers to data indicating the result of a bingo game managed by the sub game controller  52 , and contains the number of winning lines (in the case of 3×3=9 squares, this is constituted by each case of three squares located vertically, horizontally or diagonally in a continuous manner) etc. 
         [0081]      FIG. 4  is a flowchart showing a process example of the embodiment above. 
         [0082]    In  FIG. 4 , firstly in step S 1 , the main game controller  51  commences the acceptance of bets in a main game.  FIG. 5  shows an example of a display screen during the acceptance of bets in the game table display  3 . In the center of the screen, a plurality of betting targets is displayed together with odds, and the areas of players are respectively displayed at the upper and lower ends of the screen, on the left and right. Further, a remaining time during which bets can be accepted is displayed between the player&#39;s areas on both sides of the screen in the longitudinal direction. 
         [0083]    Returning to  FIG. 4 , in step S 2 , the main game controller  51  determines whether or not the time specified as the betting time  102  ( FIG. 3A ) has passed after commencement of the acceptance of bets. 
         [0084]    If such specified time has not passed (NO in step S 2 ), in step S 3 , the main game controller  51  determines whether or not a player has made bets. 
         [0085]    If the main game controller  51  determines that no bet has been made (NO in step S 3 ), it returns to a determination on the passage of a betting time (step S 2 ). 
         [0086]    If the main game controller  51  determines that a bet has been made (YES in step S 3 ), in step S 4 , the sub game controller  52  performs a stake sharing process for each player that has made a bet. It is assumed here that the sub game controller  52  performs a stake sharing process from the viewpoint that such process is for a sub game; the main game controller  51  may perform such stake sharing process. 
         [0087]    A bet stake-sharing-process is performed according to the following procedure. 
         [0088]    (a) A winning stake per bet is calculated by: 
         [0089]    (set payout ratio−position payout ratio)×bet stake-share-ratio. A set payout ratio is acquired from the set payout ratio  101  ( FIG. 3A ). A position payout ratio is acquired from the position payout ratio  105  for each betting target ( FIG. 3B ) based on the betting target ( FIG. 3A ). A bet stake-share-ratio is acquired from the bet stake-share-ratio  107  ( FIG. 3A ). In principle, a position payout ratio is set so as to have a value smaller than that of a set payout ratio, and thus, the value of the above expression will be positive. Exceptionally, when a position payout ratio has a value greater than that of a set payout ratio, “0” is employed for the value of the above expression. 
         [0090]    (b) A necessary stake for a one-scale-value increase of a grade meter is calculated by: 
         [0091]    1/jackpot allotment magnification. A jackpot allotment magnification is acquired from the jackpot allotment magnification  106  ( FIG. 3A ). 
         [0092]    (c) A grade meter increase probability is calculated by: 
         [0093]    winning stake per bet/necessary stake for a one-scale-value increase of a grade meter. 
         [0094]    (d) A random drawing is performed the number of times corresponding to the number of bets based on the calculated grade meter increase probability (a drawing whose winning probability is set so as to be equal to the grade meter increase probability). The number of bets is acquired from the number of bets  121  ( FIG. 3A ). 
         [0095]    (e) For each of the random drawings repeated the above number of times corresponding to the number of bets, the scale value of a grade meter (the present scale value  125  in  FIG. 3A ) is increased by one in the case of a win. With such increase of the scale value of a grade meter, the bar extends in the grade, and when the next grade is reached, the present grade (the present grade  126  in  FIG. 3A ) is changed (updated). 
         [0096]      FIG. 6  shows an example of a display screen in a state in which: the bets made by the lower left (focused-on) player (in the screen&#39;s lateral position) have caused the present grade to change from “MINI” to “BIG”; and the “MEGA” bar has then started to extend. 
         [0097]    Referring back to  FIG. 4 , after the bet stake-sharing-process (step S 4 ), the process returns to the determination on the passage of a betting time (step S 2 ). 
         [0098]    If the main game controller  51  determines that a betting time has passed after commencement of the acceptance of bets (YES in step S 2 ), in step S 5 , the main game controller  51  terminates the acceptance of bets in the main game. 
         [0099]    Next, in step S 6 , the main game controller  51  performs a drawing for a dice game serving as the main game. That is, three dice are blown up and are then dropped.  FIG. 7  shows an example of a display screen during a drawing. On the display screen, “During Dice drawing” is displayed in the area of the player who has made bets while “Wait for Next Game” is displayed in each of the areas of the players who have not made any bets. 
         [0100]    Then, referring back to  FIG. 4 , when, in step S 7 , the rolled numbers of the dice are fixed, in step S 8 , the main game controller  51  then determines whether or not a sub game is in execution. Explanation is continued here assuming that a sub game is not in execution. 
         [0101]    If it is determined that a sub game is not in execution (NO in step S 8 ), in step S 10 , regarding the main game, the main game controller  51  provides an allotment in accordance with rolled numbers. That is, if a betting target wins, an allotment obtained by multiplying the odds set for such betting target by the number of bets is paid out.  FIG. 8  shows an example of a display screen in a state in which an allotment of “40” has been provided to the lower left player. 
         [0102]    Next, referring back to  FIG. 4 , in step S 11 , the sub game controller  52  performs an allotment stake-sharing-process for each player. It is assumed here that the sub game controller  52  performs such stake sharing process from the viewpoint that such process is for a sub game; the main game controller  51  may also perform such process. 
         [0103]    An allotment stake-sharing-process is performed according to the following procedure. 
         [0104]    (a) A winning stake per bet is calculated by: 
         [0105]    ((set payout ratio−position payout ratio)/winning probability)×allotment stake-share-ratio. A set payout ratio is acquired from the set payout ratio  101  ( FIG. 3A ). A position payout ratio is acquired from the position payout ratio  105  for each betting target ( FIG. 3B ) based on the winning betting targets  123  ( FIG. 3A ). A winning probability is acquired from the winning probability  103  for each betting target ( FIG. 3B ) based on the winning betting targets  123  ( FIG. 3A ). An allotment stake-share-ratio is acquired from the allotment stake-share-ratio  108  ( FIG. 3A ). In principle, a position payout ratio is set so as to have a value smaller than that of a set payout ratio, and thus, the value of the above expression will be positive. Exceptionally, when a position payout ratio has a value greater than that of a set payout ratio, “0” is employed for the value of the above expression. 
         [0106]    (b) A necessary stake is acquired by: 
         [0107]    1/jackpot allotment magnification. A jackpot allotment magnification is acquired from the jackpot allotment magnification  106  ( FIG. 3A ). 
         [0108]    (c) A winning jackpot value is calculated by: 
         [0109]    winning stake/necessary stake. 
         [0110]    (d) Regarding all of the grades, the calculated winning jackpot value is added to the jackpot value  127  for each grade ( FIG. 3A ).  FIG. 9  shows an example of a display screen in a state in which, regarding the lower left player, the addition of “10” has been performed to each of the jackpot values of the four grades of the grade meter. It should be noted that, due to the maximum values specified by the initial and maximum jackpot values  110  for each grade ( FIG. 3D ), when such addition of a jackpot value results in an excess over the maximum values, such excess is retained internally and carried over to the start of the next sub game. 
         [0111]    (e) The odds acquired from the odds  104  for each betting target ( FIG. 3B ) based on the winning betting targets  123  ( FIG. 3A ) are subtracted from the sub game startup point  124  ( FIG. 3A ).  FIG. 10  shows an example of a display screen in a state in which, regarding the lower left player, two betting targets with odds of “2” have won, so that the sub game startup point has been reduced by “4,” resulting in “96.” 
         [0112]    Next, referring back to  FIG. 4 , in step S 12 , the main game controller  51  determines whether or not a sub game start condition has been satisfied. In the state seen in  FIG. 10 , the sub game startup point has not reached the sub game start condition “0”; when the sub game startup point reaches “0” by repeating the above-described main game process, the sub game start condition is satisfied.  FIG. 11  shows an example of a display screen in a state in which the sub game start condition has been satisfied with the sub game startup point of the lower left player having reached “0.” 
         [0113]    Referring back to  FIG. 4 , if the main game controller  51  determines that a sub game start condition is satisfied (YES in step S 12 ), in step S 13 , the sub game controller  52  then starts a sub game. That is, the rolled numbers of a die (either one rolled number may be employed, or multiple rolled numbers—regarding which it is sufficient for any one of such numbers to produce a match—may be employed) are assigned randomly to each of the squares (e.g., 3×3=9 squares), and a state is then produced in which, with such squares being displayed in place of the bars of a grade meter, rolled numbers in a dice game serving as the main game are waited for.  FIG. 12  shows an example of a display screen in a state in which, regarding the lower left player, bingo-game squares are displayed, at a part where a grade meter was displayed, with the correspondence being shown between the number of winning lines and the allotments. 
         [0114]    Referring back to  FIG. 4 , after the start of a sub game (step S 13 ), the process returns to commencement of the acceptance of bets in the main game (step S 1 ). If the main game controller  51  determines that a sub game start condition is not satisfied (NO in step S 12 ), the process returns to commencement of the acceptance of bets in the main game while a sub game has not been started (step S 1 ). 
         [0115]    If a sub game is started, in the subsequent step, if rolled numbers in the main game are fixed (step S 7 ), it is then determined that the sub game is in execution (YES in step S 8 ), and thus, such rolled numbers are reflected in the sub game in step S 9 . That is, when the rolled numbers assigned to the respective squares of the bingo game are compared with the rolled numbers in the main game, and such rolled numbers in the main game match any of the rolled numbers for the squares, the relevant square serves as a line component for a win (in general, an “occupied” “open” state). Then, if such three squares, as line components, are located vertically, horizontally or diagonally in a continuous manner, the continuous line serves as a winning line.  FIG. 13  shows an example of a display screen in a state in which, regarding the sub game of the lower left player, three squares, the upper left corner, upper center and left center squares, are open.  FIG. 14  shows an example of a display screen in a state in which, regarding the sub game of the lower left player, five winning lines have been formed.  FIG. 15  shows an example of a display screen in a state in which, regarding the sub game of the lower left player, a jackpot (the formation of eight winning lines) has been achieved. 
         [0116]    The sub game ends after being executed a predetermined number of times (the number of times comparisons are performed with the rolled numbers in the main game). An allotment is then provided in accordance with the number of winning lines that have been formed until the time point. 
         [0117]    Further, when the sub game ends, the state of a grade meter returns to the initial state, in principle; the accumulated scale value in the middle of the previously determined present grade is carried over to the next sub game. Moreover, the excess over the maximum values of the jackpot values for the respective grades is also carried over to the next sub game. 
         [0118]    As described above, the embodiments provide the following advantages. 
         [0119]    (a) A value depending on the difference between a set payout ratio and a position payout ratio for a betting target is accumulated as a stake, and a sub game with a payout ratio of 1 (100%) is executed; thus, it is possible to have an actual payout ratio of an entire game apparatus converge to a desired set payout ratio even if the odds for such betting target are fixed. Therefore, the effort of an operator setting the odds for each betting target can be saved, it is also possible to prevent a comparison, which derives from the fact that the set payout ratio of an entire game apparatus can be expected from odds set for each betting target, from being made regarding the businesses with good/poor allotments. Further, even if the odds set for each of a plurality of betting targets have an inappropriate value inconsistent with the winning probability, because the actual payout ratio of an entire game apparatus will converge to the set payout ratio set by an operator, the game media can be paid out fairly, regardless of the odds for a betting target bet by a player. 
         [0120]    (b) The stake accumulation state of a sub game is displayed by a grade meter, whereby a player can still be provided with a sense of expectation for such sub game. 
         [0121]    (c) A sub game stake is accumulated separately as both a bet stake and an allotment stake, whereby such sub game stake can be increased even when no win has been gained, resulting in an increase of the player&#39;s enjoyability. 
         [0122]    (d) The scale value of a grade meter is increased when a bet is made, and jackpot values are increased when an allotment is provided, by way of which an acceptable stake accumulation can be carried out. 
         [0123]    (e) The increase of the scale value of a grade meter causes a shift to an upper grade, by way of which it becomes easy to understand the degree of stake accumulation by intuition. 
         [0124]    (f) A sub game is executed with reference to a grade whose maximum value has been reached by the scale value of a grade meter at the start of the sub game, whereby it can be ensured that an accumulated stake is utilized as effectively as possible. 
         [0125]    (g) The scale value kept in a grade meter at the end of a sub game and an excess over the maximum values of jackpot values is carried over to the next sub game, whereby it can be shown to a player that his/her stake has not been wasted. 
         [0126]    (h) The odds for winning betting targets are subtracted from a point value that starts from a predetermined initial value, and a sub game commences when such point value becomes zero, by way of which it becomes easy for a player to understand the time when a sub game will commence. 
         [0127]    (i) Odds for each of a plurality of betting targets are set such that a position payout ratio has a value lower than that of a set payout ratio, by way of which stake sharing can be performed effectively with respect to a sub game. 
         [0128]    (j) When a plurality of odds is set for subdivided events of one betting target, a position payout ratio is calculated by performing an addition of the respective products of the winning probabilities for such subdivided events and the corresponding odds, whereby an appropriate stake calculation can be carried out. 
         [0129]    All of the embodiments and conditional expressions contained in the specification are intended to be contributory, from an educational viewpoint, to the reader&#39;s understanding of the invention and the concept by the inventor for technological development, and limited interpretations should not be made based on such specifically described examples and conditions. Further, the configurations of such examples in the specification are not related to the indication of the merits and demerits of the invention. Although one or a plurality of embodiments has (have) been described in detail, it should be appreciated that various changes, alternatives and modifications may be made without departing from the gist and scope of the invention. 
       DESCRIPTION OF REFERENCE NUMERALS 
       [0000]    
       
         
           
               1  Game apparatus 
               2  Operation casing 
               3  Game table display 
               4  Operation table 
               5  Operator 
               6  Medal slot 
               6   a  Medal detector 
               7  Operation table speaker 
               8  Medal discharge hopper 
               9  Medal outlet 
               10  Dice upward-blowing casing 
               11  Column 
               12  Ceiling 
               13  History display 
               14  Upward-blowing casing speaker 
               15  Base 
               16  Upward-blowing pipe 
               20  Game field 
               35  Stepping motor 
               36  DC axial-flow fan 
               46  Camera 
               47  Infrared LED 
               50  Control unit 
               51  Main game controller 
               52  Sub game controller 
               53  Upward-blowing controller 
               54  Rolled-number detection processor 
               55  Display controller 
               56  Sound controller 
               60  Storage unit 
               61  Game program 
               62  Control data