| 摘要 |
PROBLEM TO BE SOLVED: To provide a player with a some quality of privilege and prevent monotony of a game. SOLUTION: A SB (single bonus) concentration mode improved with a win probability to the SB and a minor symbol combination concentration modes A and B improved with the win probability to a specific minor symbol combination are set. In the SB concentration mode, even if the player internally wins the SB, a game restricting the formation of the win is executed. If the player wins the minor symbol combination shifting lottery in the SB concentration mode, the game is shifted to the minor symbol combination concentration mode B and returned to the SB concentration mode via the minor symbol combination mode A. In the minor symbol combination modes A and B, a game wherein the formation frequency of the minor symbol combination win is changed according to the skill of spot-depressing of the player is executed. In especially, the minor symbol combination concentration mode B is set not to be shifted to another mode till the game is executed preset number of times. COPYRIGHT: (C)2005,JPO&NCIPI
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