To provide a program, information storage medium, handheld game machine, and game system by which a player can experience a real simulated performance.
A game mode is determined to be shifted from a main game mode to a music instrument playing mode enabling the player to play a music instrument performance using an operation section 160 in the case that a predetermined game event is generated in the main game mode allowing a character to act in an object space by the player using the operation section 160 or in the case that a predetermined operation is done in the main game mode, the input mode in the operation section 160 is set to the input mode for a music instrument performance mode different from the input mode of the main game mode in the case that the game mode is determined to be shifted from the main game mode to the music instrument performance mode.
Inoue Ichi
Mitsue Obuchi