Invincibility
At the "Press Start" screen, press Right, X, R1, Triangle, Up, L2, X, Left, L1, Circle, X, R2. If you entered the code correctly, the screen will flash.

No power-ups
At the "Press Start" screen, press Down, Up, X, Square, Down, Up, X, Square, L1, L2, Square, Circle. If you entered the code correctly, the screen will flash.

Boss mode
At the "Press Start" screen, press R1, Triangle, Down(2), X, L2, Left, Square, Right, Triangle, R2, L1. If you entered the code correctly, the screen will flash.

Training missions
At the "Press Start" screen, press Square, Up, L2, Left, Triangle, X, R2, Circle, Right, R1, Square, Circle. If you entered the code correctly, the screen will flash.

All weapons
At the "Press Start" screen, press Up, Down, X, Square, R1, Triangle(2), Left, Circle, L1(2), Right. If you entered the code correctly, the screen will flash.