To give spurs to a player by changing probabilities of aligning performance symbols (e.g., bonus symbols, white 7 symbols, red 7 symbols, and black bar symbols) during a type 1 BB (Big Bonus) or type 2 BB according to a game state.

When a player wins BB1, a main control part selects a freeze performance lottery table according to a game state where BB1 is internally won in S800. In S804, when the player internally wins white 7 minor symbol combination, ART (Assist Replay Time) is settled. The main control part transfers to S810 and executes a freeze performance lottery using the freeze performance lottery table shown in Figure 150(A). In S812, when the player wins a straight line performance, the main control part aligns red 7 symbols on a display window and stationarily displays them. The main control part selects an ART lottery table in S814 to execute an ART lottery, adds the number of ART sets within a range from 1 to 10 sets, and transfers to S816. When the player wins a plurality of sets, the control part produces a seven-rush performance by the number of winning sets, aligns the red 7 symbols on the display window and stationarily displays them.