All multi-player characters
Press R2, Circle, X, Square, Triangle, Right, Down, Left, Up, L2, L1, Circle, Square, L1, L2, L1, Circle, L2, Square at the main menu.
All magic
Start a single player game. Press Start to pause game play, then press R1, R2, L1, L2, X, Triangle, Circle, Square.
Weapons do not weaken
Start a single player game. Press Start to pause game play, then press R1, L1, X, Triangle, R2, L2, X, Triangle.
All weapons
Start a single player game. Press Start to pause game play, then press R1, L1, R2, L2, Circle, X, Square, Triangle.
One hit kills
Start a single player game. Press Start to pause game play, then press L1, L2, Left Analog-stick Up, Left Analog-stick Down, Left Analog-stick Left, Left Analog-stick Right, Triangle, Square, X, Circle.
Invincibility
Start a single player game. Press Start to pause game play, then press L1, L2, Circle, Square, L1, L2, Circle, Square.
Level select
Press L1, L2, X, Triangle, L1, L2, X, Triangle at the main menu. Note: This code can also be enabled during game play.