Set in the unstable lower caverns of the Black Mesa Research Facility, the Sublevels were critical to maintaining the rest of the facility, until the Incident occurred. All exits were sealed off by frantic workers, who soon realized their serious mistake -- they were trapped. With low food and few supplies the occupants began to fight with eachother...

There is more than meets the eye in this map...

*Tested primarily on an Intel 2ghz Celeron, 256 RAM (actually 512 but one of the sticks was knocked loose somehow) with an nVidia GeForce 4 MX.

**UPDATE
Being rather new to DM mapping I never paid much attention to R_Speeds, WPolys and EPolys.. However, I ran Sublevels with r_speeds 1 and noticed WPolys were in the 1000s so I deleted the neat little dusty light beam effect around the lights, which significantly dropped WPolys.