While playing a game, press T to enter the "Talk" function, then
 enter one of the following codes:

              Cheat Code - Result
              mpgod - God mode mpkfa - Full ammo, armor, and health
              mphealth - Full health mpammo - Full ammo
              mparmor - Full armor
              mpclip - Toggle clipping
              mppos - Toggle coordinate display
              mpcamera - Adjust camera
              mplightscape - Adjust lighting