Puyo Puyo! 15th Anniversary Cheats - PSP
Primary Collection of Cheats
Unlock Everything
To unlock all hidden characters, rulesets, and other settings, enter the following code at the title screen in the specified order. If entered correctly, there will be a chime heard and the game will go to the main menu:
While holding [L]+[R], press [Up], [Down], [Right], [Left], [Triangle], [X], [Square], [O]