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Pause the game and enter
L1, R2, L2, R1, SELECT.
Unlock All Missions:
At the title screen enter
X, L2, TRIANGLE, R2, SELECT.
Unlock All Guns
At the main menu enter
X, LEFT, TRIANGLE, SQUARE, X, SELECT.
Unlocks Maps for Quick Mission Mode:
At the title screen enter
R1, L1, L1, R1, R1, R1