A game machine includes, an operating portion, a signal detector, a prompter, a determination receiver and a speed changer. The operating portion outputs a signal in accordance with a player's operation for proceeding a game. The signal detector detects either a consecutive signal within a predetermined period of time or an intermittent signal within a predetermined period of time from the operating portion. The prompter prompts a player to determine whether to change a speed of progress in the game when either the consecutive signal or the intermittent signal is detected. The determination receiver receives a player's determination regarding the change of the speed of progress in the game. The speed changer changes the speed of progress in the game in accordance with the player's determination when the player's determination is received.