Cheat Codes:
Start the game with the -enableconsole command line parameter. Then, press ~ during game play to display the console window. Type one of the following codes and press [Enter] to activate the corresponding cheat:
CHEAT FUNCTION – CHEAT CODE
God mode – god
Flight mode – fly
Disable flight mode – etheral or walk
Upgrade weapon by one level – upgradeweapon
Toggle HUD – showhud
Slow motion; 1 is normal speed – slomo