To provide a game machine capable of increasing game amusements and promoting continuous games by allowing shift to an imparting rate improved state in which an imparting rate of a privilege game is improved during process of imparting the privilege game such as an ART game and after the end of a privilege game related to the imparting.

When a mode shift point value reaches a first reference value N1, a high probability game mode flag is turned on. When the high probability game mode flag is turned on, a game period of a high probability game mode in which the imparting rate of an ART game is improved is set. Shift to the ART game state is made possible on the basis of the fact that imparting of an ART privilege game is determined during the high probability game mode. When the ART game related to the determination of the imparting is ended, recovery to the high probability game mode is made possible during the remaining period of the high probability game mode.