KVELLER

Some quakeIII arena maps had portals... Quite a few of them, relatively speaking of course. IIRC, those were the least frequented maps, because of how intrusive these portals can be to gameplay, since every "warp" automatically spoils your aim.

Yeah, but I'm talking about portals that are "merged" with the environment. They just look like a normal passageway and you can even shoot through them. Basically, the only way you can tell there's a portal in there is because of 3D logic. You know, like you're going through a hallway that should circle back to a room you were before but it takes you to somewhere completely different.

Some portals in quakeIII were made so you could see what was on the other side, you couldn't shoot through them though, which was fair game, since the exit was much like what we're used to from doom or quakeI/II. What you describe there seems more like something I'd call "wormholes", because of how 2 locations are connected in a seemingly impossible way. I like the idea in and of itself though, but I can't say if I would ever get comfortable with playing in such an arena because of weird the connections might be. With any luck that new game John Romero is working on may be headed in that direction as well. Who knows?