GAME MACHINE

PROBLEM TO BE SOLVED: To reduce capacity of a storage on a main control board without increasing variation patterns beyond necessity while increasing the number of ready-to-win performances having different performance time.SOLUTION: The main control board 110 determines a first variation pattern with which first time from a variation start period of a special symbol is correlated and a second variation pattern with which second time from an interrupt start period is correlated. Then, the main control board 110 determines variation time of a special symbol based on the first time, second time, and interrupt start period, and transmits commands corresponding to the respective variation patterns to a performance control board 120. Also, an interrupt random number value is acquired. When the interrupt random number value is not less than an additional random number value, the interrupt start period is determined based on time obtained by multiplying the interrupt random number value by an interrupt interval. Conversely, when the interrupt random number value is not less than the additional random number value, the interrupt start period is determined based on time obtained by multiplying a random number value where the interrupt random number value and the additional random number value are added by the interrupt interval.