Level select:
At the title screen, press Square, Square, Square, Square, Square, Triangle, Triangle, Triangle, Triangle, Triangle, Triangle, Triangle, Circle, Circle, Circle.
Invincibility:
Pause the game and press Triangle, Triangle, Right, Left, Right, Left, Down, Left.
Max power:
Pause the game and press Up, Up, Down, Down, Down, Left, Right, Left, Right, X, Circle.
