Games like Zombie Army 4: Dead War - Mission 3: Deeper than Hell

If you finished Zombie Army 4: Dead War - Mission 3: Deeper than Hell, the closest matches are Hrot, F.E.A.R. 2: Project Origin, The Darkness, Quantum Error and GunZ: The Duel. All 8 share its shooter genre and are ranked by how closely their themes and modes overlap.