Back to the Future Part II and III/codes

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Skip To Part III: To start your game at Part III, press and hold down Select, A, and B while also pressing Start at the game title screen. You'll go to a screen where you must rearrange a series of letters until it reads FLUX CAPACITOR IS THE POWER. When it does, you'll return to the game title screen. Press Start and an altered version of the intro screen will appear, which afterward you'll begin your game in Part III.