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.

2116 says

9/10 - Agree (3) Disagree

Very impressive to be a half life mod, the history is intriguing and effects looks very well, same as music. There is only defect, it's too short and adicctive!!