Here are a few cheats to get you started
Enter these at the level select screen:
Invincibility - R,Z,C down,R,R.
Infinate Ammo - C up,Z,C left,Z,C left.
High Powered 9mm Pistol - R,L,C down,C up,C down.
Uzi with 30 rounds - C right,C left,C right, C down,C down.
7.65 Silenced Pistol - C up,L,C right,C left, C down.
