Mageslayer
PC
Press ~ to enter the console then type:
FlyFlymode On/Off NoClipNo Clipping On/Off Impulse 11God Mode Impulse 43First of the five impulses that cause death Impulse 69Second of the five impulses that cause death Impulse 137End Credit Music Impulse 151Third of the five impulses that cause death Impulse 666This is the impulse that crashes the game Map nWarp (where "n" is the level name)
Thanks to Revolution readers Matt “Wings” Langis and David Zahler!