File:Quake1.gif E4M1: the Sewage System Game Episode Designer Level Editor Soundtrack Level Theme Previous Map Next Map Specific Information Enemies Secrets New Weapons New Powerups New Obstacles New Enemies New Misc [Source] This level brings back the Rottweiler, Grunt, and Enforcer. The player must search for the Gold Key in order to proceed. This level spends a lot of time under the Water while trying to unlock Flood Gates, Doors exclusive to this level by finding and pressing numerous Buttons.