Enter the following at the title screen.
Effect | Code
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Black and White Color Scheme | Die while holding L + B to start playing the game in a black and white color scheme.
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Introductory Level Skip | Press Start + Right + Y.
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Invincibility and High Jump | Hold Right, Y, L and A, then press start. During the game, press L to become invincible and R to jump higher.
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Play as Miniature Ardy | Place the cursor on Game Start in the Presentation Screen, then press Up + X + Start (in that order).
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Sepia Color Scheme | Die while holding L + A to start playing the game in a sepia color scheme.
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