All characters:
Enter the Single or Endless mode starting menu, then quickly press Up, Down,
Triangle, Square, Start. A sound will confirm correct code entry.

All characters and intermission sequences:
Choose the "Gallery" selection at the options menu. Highlight the "View Cutscenes"
option, then hold Square and press Up, Down, Left, Right.

Play as Popoi:
Successfully complete the WakuWaku course under the normal difficulty setting.

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.