Pause the game, then hold L2 or R2 and press Left, Up, Up, Triangle, Right, Square, Left, Triangle, Up, Down, Right, Right
Debug Mode
Pause the game and hold L2, then press Left, Triangle, Left, Left, Circle, Left, Triangle, Right, Circle, Up, Up, Down
Infinite Spirit Spells
Pause the game, hold L2 or R2, and press Right, Right, Left, Triangle, X, Up, Circle, Left
Invincibility