Cheat mode:
Press ` to display the console. Then, type one of the following codes and press [Enter] to activate the corresponding cheat function. Note: Except as noted, the codes can only be used in single player mode.

Effect	Code
God mode	iwillsurvive
Level select	letmego
Allow call for Arty	raindropskeepfallinonmyhead
Full ammo	takeittothelimit
Expert CPU	hitmewithyourbestshot
Invisibility	closetoyou
Set gamma level	gamma <number>
Toggle turbo mode2	turbo
Ban indicated IP address2	ban <IP address>
Temporarily ban indicated IP address2	punt <IP address>
Mute indicated player's text talk	bozo <IP address>
Faster running	turbo
Brighter display1	sky
End mission and start next map on host	resetgames
Stop game on host when mission is over	LastGame

1. Can also be enabled in multi-player mode.
2. Only when your machine is hosting a multi-player game.