Home: Game Cheats: TurboGrafx 16

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Sound test:

Press II, Select, Up, Run at the "New Game/Continue" screen. 

Level select:

Press Up, Left, Down, Right, Run at the "New Game/Continue" screen. 

View ending sequence:

Press Up, Up, Down, Down, Left, Right, Left, Run at the "New 
Game/Continue" screen. 

Four screen mode:

Press Up, Right, Down, Left, Run at the "New Game/Continue" screen.