Entry location: Enter these codes anytime the words "Press Start" are flashing on screen.
Down,R1,Up,L1,Square,X,Triangle,O - Unlocks Alia Buster in the Chip Dev. Menu
Square,Square,Right,X,R1 - Unlocks Layer Rapier in the Chip Dev. menu
R1,X,Left,Square,Square - Unlocks Pallet Bullets in the Chip Dev. menu