To permit the occurrence condition of an extraordinary specific win to occur while conforming to an occurrence probability of the specific win predetermined by a set value in a rotary drum type game machine equipped with a winning determination means to determine the winning of a plurality of kinds of wins by extracting the random number for every time when a game is performed by a plurality of reels capable of variably displaying a plurality of patterns, and capable of causing a specific winning condition when the result of determination of the winning determination means is the winning of the specific win and a combination mode of patterns corresponding to the specific win is derived and displayed on an effective line.
The rotary drum type game machine has a selection means for variable winning probability value (a game control device 50) sequentially selecting a plurality of variable winning probability values and a winning probability setting means (the game control device 50) setting a selected variable winning probability value so as to make an average value nearly equal to a reference value corresponding to a main set value set by a main setting change means (the game control device 50, a probability setting device 60).
Yoshio Arafune
Tomio Dainichi
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