Puyo Pop Fever  PSP

It it possible to use any playable character in Single and Endless modes by inputting the following codes into the Single (RunRun, WakuWaku, HaraHara, Free Battle) screen and the Endless (Fever, Mission, Endless) screen. These must be entered fairly quick. If done right, you will hear the "All Clear" tone and be brought to the character selection screen.