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XBox - Puyo Pop Fever cheats

In-game reset:
Hold A + B + X + Y and press Start during game play to return to the main menu. 

Unlock Popoi:
Play in normal mode, and finish the WakuWaku course

Unlock Carbuncle:
Finish the HaraHara course maximum 4, or minimum 12 fevers without any continues
Or
Finish the game with your number of continues as a multiple of seven. 

Unlock all characters:
Go to Single or Endless mode starting menu.
Push Up, Down, Y, X, Start buttons.