Activate the trainer by pressing F1 at main menu
See below for hotkeys and cheats
Numpad 1 : Unlimited Health
Numpad 2: Unlimited Ammo
Numpad 3 : No Reload
Numpad 4: One Hit Kill
Numpad 5 : No Recoil
Numpad 6: Auto Aim
Numpad 7 : Zoom in
Numpad 8: Super Score
Numpad 9 : Save Position – Teleport
Numpad 0 : Load Position