Archon ---> Quake. You heard right, elements of the 80's micro game archon extrapolated into the Quake universe. Get ready for a wild ride. (free stuff | no warranty | see disclaimer.txt | blah blah blah.)
"Quantum tunnel apparatus" - Quake ones original portal gun. Credit: Howard Roy
One of the hazards of allowing chaotic things to happen: you sometimes fall out of the level.
Shown here: A quantum portal dumps the player in the void. the "Quantum tunnel apparatus" OS restores the player to the portal entry and displays a cool message.
A similar feature I have titled "grace" will save any player fallen into the void for any reason. Although not as quickly...