| 摘要 |
PROBLEM TO BE SOLVED: To change a base between a low probability time shortening state and a high probability time shortening state even in the same time shortening state.SOLUTION: A game property that a first special symbol and a second special symbol are varied in parallel is adopted, in a firework rush (a high probability time shortening state), variation time of the second special symbol is set shorter than that of the first special symbol, and in a coast mode (a low probability time shortening state), variation time of the first special symbol is set shorter than that of the second special symbol. Thus, in the firework rush, a frequency with which the second special symbol is variably displayed is high, whereas in the coast mode, a frequency with which the first special symbol is variably displayed is high. In a first special symbol lottery, there is no occurrence of a small winning, while in a second special symbol lottery, a probability at which the small winning occurs is set to one-third, so that the small winning is more likely to occur while staying in the firework rush than in the coast mode. Thus, in the firework rush, it is possible to improve the base by a small winning game frequently executed. |
