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Nintendo Wii - Puyo Puyo cheats

Unlock Sound Test in the options:
Press A, A, Left, B, B, Left, C, C while you are at the title screen.
If the code is accepted, you will hear a sound. Go to the Options menu to 
access to the unlocked Sound Test option.

Completion bonus - Unlock Sound Test in the options:
Finish the game on any difficulty level.