While playing, press \'~\' (pressing the \'Pause\' key is useful),
enter one of the following codes and press [Enter] to activate: 

Code                  Result
------------------------------ 
GiveMeAll           - All Cheats
GiveMeFuel          - Add Fuel
MoreLives           - Add Lives
HealthMe            - Full Health
GiveMeInvulnerable  - 30 sec. God Mode
GiveMeInvisibility  - 30 sec. Invisibility
GiveMeAllAmmo       - All Weapons & Ammo