PROBLEM TO BE SOLVED: To moderate the disadvantage of a player starting a game in a lowest game mode while keeping the balance with a game parlor side and sufficiently satisfy the player with the taste of the game corresponding to the initial investment.;SOLUTION: After a special game held under a game mode having the lowest winning probability and lottery efficiency, this game machine shifts it to a game mode having the highest winning probability and lottery efficiency according to a first shift rate. After a special game held under a game mode having a high winning probability and a low lottery efficiency, this game machine shifts it to the highest game according to a second shift rate. The product obtained by multiplying the low value of the winning probability by the first shift rate is larger than the product obtained by multiplying a high value of the winning probability by the second shift rate. The lowest game mode which is thus made high probability of shifting to the highest game mode and given an indulgent winning probability is not always a disadvantageous one and, even if the player selects a game machine with the lowest game mode, this constitution can moderate the disadvantage of the player.;COPYRIGHT: (C)2008,JPO&INPIT
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