Level Select
     At  the  Title  screen,  press  Square(5x), Triangle(7x), 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.