Level Select
     At  the Main Menu, highlight New Game and press Triangle, Square,
Circle, Triangle, Square, Up, Up, Up. If done correctly, you will hear
a sound.

Full Shield and Attack
     At  the Main Menu, highlight New Game and press Triangle, Square,
Triangle, Square, Square, Up, Up, Up. If done correctly, you will hear
a sound.

Invincibility
     At  the  Main  Menu,  highlight  New  Game  and press Up, Up, Up,
Circle,  Square,  Up,  Right, Left. If done correctly, you will hear a
sound.