Phobos Lab Teleporter

[Doom Trooper]

If your playing Phobos Lab avoid using the pentagram-shaped teleporter near the end because it will just send you back to the beginning of the level and douse't serve much purpose? 

[wheresthebeef]

Romero got a sweet deathmatch frag with a rocket launcher running through that pentagram teleporter

[ASD]

Your game is rigged.