At the Press Start" screen, press Up, Down, Circle, R2, Left, L2, Right, X, R2, Square, Up, R1.
Alien Data Unlocked
At the "Press Start" screen, press Square, L1, Circle, L2, Down, Triangle, R1, Right, X, Left, R2, Triangle.
All CST Unlocked
At the "Press Start" screen, press Square, Up, L2, Left, Triangle, X, R2, Circle, Right, R1, Square, Circle.
All Weapons
At the Press Start screen, press Up, Down, X, Square, R1, Triangle, Triangle, Left, Circle, L1, L1, Right. If done correctly, the screen will flash.
Backflip
Press Square + Down.
Better guns
Get better guns by using Agent K.
Boss Mode Unlocked
At the "Press Start" screen, press R1, Triangle, Down, Down, X, L2, Left, Square, Right, Triangle, R2, L1.
Defeating Bosses
When fighting the Bosses, it is just as easy to use your pistols than any other gun,
Don't Drop Pickups When Hit
At the "Press Start" screen, press Down, Up, X, Square, Down, Up, X, Square, L1, L2, Square, Circle.
Faster speed
If you want to be faster, use Agent J.
Full area effect
At the "Press Start" screen, press Left, X, Triangle, Up, X, Down, Square, L2, Left, R2. If you entered the code correctly, the screen will flash.
Full beam
At the "Press Start" screen, press Left, Circle, Triangle, Right, L1, Square, Left, R1(2), Triangle. If you entered the code correctly, the screen will flash.
Full bolt
At the "Press Start" screen, press Left, Right, Up, Down, L1, Circle, Triangle, R2, Left, Down, Square(2). If you entered the code correctly, the screen will flash.
Full homing
At the "Press Start" screen, press Right, Up, Square, L1, Left(2), L1, Left, Circle, Left. If you entered the code correctly, the screen will flash.
Full spread
At the "Press Start" screen, press L2, R1, Circle, L2, Down, Up, L1, Right, Left, X. If you entered the code correctly, the screen will flash.
Invincibility
At the "Press Start" screen, press Right, X, R1, Triangle, Up, L2, X, Left, L1, Circle, X, R2.
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.
Somersault
Press Forward + Square.
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.
Unlock All Levels
At the "Press Start" screen, press R2, Triangle, Left, Circle, Square, L2, Left, Up, X, Down, L2, Square.
Unlock Making of Mode
At the "Press Start" screen, press Circle, R2, L2, Circle, Triangle, Down, Square, X, Right, L1, X, Up.