+ set game roarke command will give you this :
Where is everybody ? :)
The Quake 2 first level with the DoD mod weapon, the knife. But, the npc are missing.
Setting +set game roarke, show the mod in the proper way. So, a bit like a dos command put bad will kill the game console and put your player in the Quake 2 setting with only sounds and effects working.