Home: Game Cheats: GameCube

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Unlimited ammunition:
Press X, B, X, Y, A, B, A(2) at the title screen. 

Unlimited health:
Press A, X, A, Y(2), B, X, Y at the title screen. 
Once you or a CPU dies, your/their health bar 
replenishes to the maximum.

All arenas: 
Press Y, X, Y(2), A, B, X, B at the title screen. 

All costumes: 
Press X(2), A, B, X, Y, A, X at the title screen.