At the options menu, choose the "Gallery" selection. Highlight the option to view the intermission sequences, then hold X and press Up, Down, Left, Right to unlock all characters and intermission sequences. If you entered the code correctly, you will hear a sound.
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.
Either get less than four or more than twelve fevers without any continues in HaraHara mode to unlock Carbuncle. Alternately, successfully complete the game with your number of continues as a multiple of 7.
Successfully complete WakuWaku mode to unlock Popoi.
Have the Game Boy Advance game Puyo Pop Fever in the cartridge slot to unlock bonus pictures in the gallery.
Successfully complete WakuWaku mode in single player mode. Rider will now appear instead of Amitie at the title screen.
Blow into the microphone at most game menus to move bubbles around.
While playing the game, blow into the microphone.