Cheat Codes:
Press [F1] or ~ during game play to display the console window. Then, enter one of the following codes to activate the corresponding cheat:
CHEAT FUNCTION – CHEAT CODE
God mode – please god
All items – please giveall
Kill all enemies – please killall
Open all doors – please open
Flight mode – please fly
No clipping mode – please ghost
Invisibility – please invisible
Recover health – please refresh