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.
We are currently experimenting with having various Hit Box sets, to enhance bullet detection precision for the multiple bodygroups available per model.
As you can see, the bodygroups effects aren't only esthetic, but they also affect gameplay.
Yes, the Helmet can be shot off, and it can even be picked up as an Item that gives armor to the player.