Press F2 to display the console window, then type one of the following codes and press [Enter] to activate the corresponding cheat function. Note: Press [Tab] instead of [F2] in the demo version of the game.

Granted wish - Code

Enable God mode - invincible 1
Disable God mode - invincible 0
Disable invisibility - invisible 0
Full ammunition - ammo
Flight mode - fly
No clipping mode - ghost
Disable flight and no clipping modes - walk
View stealth amount - stealth
Full health - health
Invisibility - invisible 1
Freeze enemies - playersonly 1
Unfreeze enemies - playersonly 0
No enemies - killpawns
Spawn indicated item - summon