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.

sarevokh says

10/10 - Agree (69) Disagree (4)

One of the best mod's ever done.
The House is one of the most scary places I've ever played, there is an amazing work on various action packed sequences, it has a good replayibility, an interesting and ambitious story.

What can I say after that? Nothing. Just wait for the next chapter.