Home: Game Cheats: Game Boy Advance

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10 credits:
Hold Select and press L, R, Down, L, R, Down, L, R, Right at the options
screen. 

Background music selection:
Hold Select and press R, L, R, L at the options screen. 

Expert mode:
Hold Select and press Up(2), Down(2), Left, Right, Left, Right at the
options screen.