Puyo Pop Fever (PSP)

All characters
Enter the Single or Endless mode starting menu, then quickly press Up, Down, Triangle, Square, Start to unlock all characters. If you entered the code correctly, you will hear a sound.

All characters and intermission sequences
At the options menu, choose the "Gallery" selection. Highlight the "View Cutscenes" option, then hold Square and press Up, Down, Left, Right to unlock all characters and intermission sequences.

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

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
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.