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 function.
god - God mode
fly - Flight mode
etheral - Disable flight mode
walk - Disable flight mode
upgradeweapon - Upgrade weapon by one level
showhud - Toggle HUD
[0.1-1000.0] - Slow motion; 1 is normal speed slomo
[0 or 1] - Toggle first person view behindview
allammo - Ammo for all weapons
allweapons - All weapons
loaded - All weapons, ammo and 100 adrenaline
ghost - No clipping mode
[name] - Play indicated demo demoplay
[name] - Records demo demorec
stopdemo - Stop recording a demo