Home: Game Cheats: TurboGrafx 16

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Difficulty level select:

Hold Left + I and press Select at the title screen. 

Sound test:

Hold Left + I + II and press Select at the title screen. 

Monochrome mode:

Enable the "Difficulty level select" code. Set the difficulty level 
to "Hard" with three lives per game, then press I forty-six times, II 
ninety-six times, Select.