These codes are enabled by pausing gameplay and entering them in. If the code has been entered correctly you will hear a confirmation sound.
Unlock Cheat Screen:
Press X, X, X, X, O, R1, R2, L2, Up, Left, Right, Down, Square.
Unlock Tawna as a Playable Character:
At the 'Player Select' screen hold L1 and R1.
Unlock Infinite Health:
Press Up, Up, Down, Circle, Square, L1, R2.
Unlock Unlimited Health:
Press Up, Up, Down, Circle, Square, L1, R1.
Unlock Infinite Points in Mallet Mash:
Press Up, Down, Square, Triangle.
Max Points (999) in Advent Mode:
Press Up, Up, Down, Up, Left, Left, Up, Up, Right, Circle, Square.