All characters and intermission sequences - 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.
Alternate title screen - Successfully complete WakuWaku mode in single player mode. Rider will now appear instead of Amitie at the title screen.
Bonus gallery pictures - Have the Game Boy Advance game Puyo Pop Fever in the cartridge slot to unlock bonus pictures in the gallery.
Control menu screen - Blow into the microphone at most game menus to move bubbles around.
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.
Play as Carbuncle - 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.
Play as Popoi - Successfully complete WakuWaku mode to unlock Popoi.
Taunt - While playing the game, blow into the microphone.