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.

Bor2571 says

This review may contain spoilers

10/10 - Agree (2) Disagree

Awsome mod. It actually creeped me out a bit and thats not something I can say for a lot of games And one of the first games I played were horror.