Add Weapon At the "Press Start" screen, press Up, Down, Left, Right, Circle, Square, Up, Down, Left, Right, Circle, Square. The "Add Weapon" option will now appear when the game is paused.
All Missions And Gallery Pictures Unlocked At the "Press Start" screen, press L2, R2, L1, R1, L1, L2(2), R2, L1, R1(2), R2.
Infinite Ammunition At the "Press Start" screen, press R2, R1, Triangle, L2, L1, Up, R2, R1, Triangle, L2, L1, Up.
Invincibility At the "Press Start" screen, press R3, L3, Right, Left, L1, R1, R3, L3, Right, Left, L1, R1.
Psychedelic Mode At the "Press Start" screen, press Up, R2, Circle, Left, Triangle, Square, L2, L1, Circle, R1.
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ShellShock: Nam '67 Strategy Guide
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