| 摘要 |
PROBLEM TO BE SOLVED: To provide a game machine that the difference of profit and loss between a player side and a game shop side is as small as possible and drawing for a privilege can be performed. SOLUTION: When big winning is generated, e.g. a drawing game is executed on condition of deducting a prescribed number of balls (2,000 balls, e.g.) as a privilege for a player. In accordance with the player's winning of the drawing, a certain coefficient (e.g. 2) inversely proportional to the winning probability (1/2, e.g.) of the drawing is multiplied to the number of balls deducted for the drawing and the number of balls (e.g. 4,000 balls) obtained by the arithmetic are given to the player as service balls.
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