Musashi no Bouken

Sound Test
At the title screen, after a message "PUSH START" is displayed on the screen, press A, B, A, B, A, B, Right, Select.

Press Left / Right to select between music ("1") or sound effects ("2"), press Up / Down to select the tracks, press A to play, press B to stop it.

Maximum Level
At the title screen, after a message "PUSH START" is displayed on the screen. press Select, B, A, Left, Right, B, Right, Select. A sound will confirm correct code entry. Now just start a new game.