| 摘要 |
PROBLEM TO BE SOLVED: To effectively arouse player's interest even during extension of a period of a game executed in an advantageous game state.SOLUTION: During an ART mode, the number of times of variation games controlled to the ART mode can be controlled to two types of additional modes having different expected values to be added. Further, during the ART mode, control can be performed to a high additional mode with satisfaction of rank-up conditions in a low additional mode as an opportunity even in control to the low additional mode. In satisfaction of such a rank-up condition, control is performed to the high additional mode with the fact that an additional result (accumulation) reaches a reference number in the low additional mode as an opportunity. Thus, in start of the additional mode, a player can expect to which additional mode control is performed. Contrarily, during the additional mode, the player can expect that the additional result (accumulation) reaches the reference number in the low additional mode, namely whether control is performed to the high additional mode. |
