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.
This review may contain spoilers
Great beginning but towards the end it starts to drag on. The horror parts gets replaced with fighting generic soldiers as well as broken and unnecessary stealth parts are thrown in. There's also too many exploits the player can use destroying the excellent atmosphere that the developers obviously spent a lot of time constructing.
Overall I liked it but I also feel like it could've used a bit more testing. Not as scary as I'd hoped either but it does contain a few chilling moments.