All characters and intermission sequences
Select "Gallery" at the options menu. Highlight the option to view the intermission sequences, then hold Select and press Up, Down, Left, Right. A sound will confirm correct code entry.
Endless Puyo Pop mode character select
Select the "Endless Puyo Pop" option at the main menu. Highlight any mode, then press Up, Down, Select, A. A sound will confirm correct code entry and a character selection menu will appear. To use a character's own drop set, hold Select when making a selection.