Type them in the " ` " (or "Ö" for Swedish users) console:
Code Result
iwillsurvive God mode
raindropskeepfallinonmyhead Allow call for arty < 5 Shots > can be
re-entered for more
takeittothelimit Unlimited ammo
hitmewithyourbestshot Computer Rocks!
closetoyou Enemies do not see you
gamma # Set gamma to #
turbo Run faster
Level Select
While playing, press tilde (~) to call up the console window, then type "letmego"
and press ENTER.
Reduced Sky Details
While playing, press tilde (~) to call up the console window, then type
"sky" and press ENTER. This speeds up the game and makes the world appear
brighter.