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.
It's called Underhell, and it's calling itself a mod—though it's closer to a full, stand-alone game. Specifically, an episodic survival horror-adventure...
this mod is basically a great-looking, full-blown survival horror game
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