While in-game, hit start to pause the game, then, while holding down the right trigger, enter one of the following codes: (directions refer to the control pad) If you've entered it correctly, a description of the cheat will appear on the bottom of the screen.
Cheats that do not affect the player's stats, such as invulnerability, will only remain active in the level they were entered in.
All skills max'ed - Left,Up,Right,Down
Extra skill points - Up,Up,Down,Down
Full Ammo - Up,Left,B,Down
Full Health - Down,Down,Up,Up
Health Limit Increased - A,Y,Left,Left,Right
Invulnerability for the player - B,A,X,Y
Invulnerability for your allies - B,Y,A,X
Kill all the enemies in the level-Down,Up,B,Right
Player gets a big gun - Left,Right,X,Y
Player gets all German weapons-Up,Down,Left,Right,A
Player gets all UK weapons - Up,Down,Left,Right,Y
Player gets all US weapons - Up,Down,Left,Right,X
Rapid fire mode - Down,Down,Down,Down