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Playstation 2 - SWAT: Global Strike Team cheats

Invincibility 
Pause the game while playing and enter UP, DOWN, LEFT, RIGHT, LEFT, RIGHT, L2, 
R2 on the options menu.  

Unlimited Ammo Cheat 
Pause the game while playing and enter LEFT, RIGHT, UP, DOWN, UP, DOWN, R2, 
L2 on the options menu. 

Unlock All Stages 
On the mission select screen (any mode) enter UP, L1, DOWN, R1, LEFT, L1, 
RIGHT, R1, UP to unlock all missions for that mode.