This small tutorial will explain how to play the unofficial Underhell Coop mode built into the engine. It is unstable, buggy, it will crash and lag, but...
how to play underhell - coop (unofficial version)
Underhell is a Source Engine game developed by the Underhell Team in collaboration with We Create Stuff. Underhell Chapter 1 requires ONLY Source SDK Base 2007 installed. No Source game is required.
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