Press Up, Down, Left, Right, Circle, Square, Up, Down, Left, Right, Circle, Square at the "Press Start" screen. The "Add Weapon" option will now appear when the game is paused.
All missions and gallery pictures unlocked
Press L2, R2, L1, R1, L1, L2(2), R2, L1, R1(2), R2 at the "Press Start" screen.
Press R3, L3, Right, Left, L1, R1, R3, L3, Right, Left, L1, R1 at the "Press Start" screen.
Press Up, R2, Circle, Left, Triangle, Square, L2, L1, Circle, R1 at the "Press Start" screen.
Press R2, R1, Triangle, L2, L1, Up, R2, R1, Triangle, L2, L1, Up at the "Press Start" screen.
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