| 摘要 |
PROBLEM TO BE SOLVED: To provide a game machine which is structured so as to monitor the probability of winning in a winning opening which is calculated from the number of game balls shot and the number of game balls put out at a low cost. SOLUTION: The frequency of action of a ball shooting unit is stored in a shooting frequency counter, and the number of prize balls is stored in a winning ball counter. In a winning monitoring process, the number of prize balls stored in the winning ball count counter is compared with a prescribed numerical value (2,400, 1,600, 1,200 or 800) at the time when the value of the shooting frequency counter exceeds 1,000 and a winning ball abnormality announcement processing (S1212) is performed at the time when the number of winning balls exceeds a prescribed numerical value. Consequently an extreme increase of prize balls can be externally suggested. Since the number of shot balls is detected from the frequency of action of the ball shooting unit 112a, the probability of winning in the game machine can be monitored without providing an external sensor, and cost reductions can be made, and the game machine can be made a preferable structure from the view point of a fraud prevention. COPYRIGHT: (C)2008,JPO&INPIT
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