Puyo Pop Fever Codes -

All characters and intermission sequences:
Select "Gallery" at the options menu. Highlight the option to view the intermission sequences, then hold and press , , , . A sound will confirm correct code entry. 

Get character select in Endless Puyo Pop mode:
Select "Endless Puyo Pop" at the main menu. Then, highlight a course and press , , , . A sound will confirm correct code entry. You can now play as any character in classic mode. To have a character's Puyo set, hold while selecting that character at the selection screen.

Character select in Single Puyo Pop mode:
Select "Single Puyo Pop" at the main menu. Then, highlight a course except for "Free Battle" and press , , , . A sound will confirm correct code entry.

 Play as Carbuncle:
Play in HaraHara mode. Either get less than four or more than twelve fevers without any continues. Alternately, complete the game with your number of continues as a multiple of 7.

Play as Popoi:
Successfully complete WakuWaku mode.

Hidden mini-game:
Blow into the microphone at the title screen until a number appears at the bottom of the touch screen. Use the stylus or blow into the microphone to keep the falling Puyos from reaching the bottom.

Control menu screen:
Blow into the microphone at most game menus to move bubbles around.

Bonus gallery pictures:
Have the Game Boy Advance game Puyo Pop Fever in the cartridge slot to unlock bonus pictures in the gallery.

Alternate title screen:
Successfully complete WakuWaku mode in single player mode. Rider will appear instead of Amitie At the title screen.

Taunt:
Blow into the microphone during game play.