| 摘要 |
PROBLEM TO BE SOLVED: To improve a performance effect and to improve interest in a game by diversifying changeover timing of a performance without specially complicating design work.SOLUTION: In a main control board, a special variation period is set according to the kind of a special symbol. For example, when the special symbol A is determined, a period is set to be the special variation period when the number of times of variable display of the special symbol after a special game ends is 16-30. In a sub control board, when set to be the special variation period, a lottery of a period in which a mode is set to be a second performance mode is performed. In the lottery, the period in which the mode is set to be the second performance mode becomes one period within the special variation period. For example, when the period is outside the special variation period as shown in (d), the mode is certainly set to be a first performance mode, and when the period is inside the special variation period, the mode is set to be the first performance mode or the second performance mode. |
