| 摘要 |
PROBLEM TO BE SOLVED: To suppress the decrease of interest.SOLUTION: A big prize winning game in which an opening/closing device 500 performs opening/closing operation is performed when a big prize winning is won in first or second winning/losing determination processing, and a small prize winning game in which opening/closing operation time of the opening/closing device 500 is shorter than that of the big prize winning game is performed when a small prize winning is won. When lost in the first or second winning/losing determination processing, it is determined whether or not specified conditions to be satisfied in a predetermined probability are satisfied. When the specified conditions are satisfied, the opening/closing device 500 operates in a mode which is extremely similar to the one in the small prize winning game. |
