Capcom Puzzle World Cheats - PSP

Expert Mode for Buster Buddies (Pang! 3)
Hold [L]+[R] when starting the normal game mode to unlock Expert mode.

Super Buster Bros. Level Select
At the "Select Game" screen highlight "Tour Mode". Press and hold [Down] on d-pad and press the [X] button. You can then select any stage.

Extra Hidden Characters in Puzzle Fighter
Extra characters/Character variations:

Play as Anita - Hold [L]+[R] and choose Donovan.
Play as Hsien-Ko's Talisman/Sister's spirit - Hold [L]+[R] and choose Hsien-Ko.
Play as Morrigan as a bat - Hold [L]+[R] and choose Morrigan.

Extra Hidden Characters
Play as Akuma - Highlight Hsien-Ko on the player select screen and press Down on the thumb pad
Play as Dan - Highlight Donovan on the player select screen and press Down on the thumb pad
Play as Devilot - Highlight Morrigan on the player select screen and press Down on the thumb pad