Another game using the Source engine, you'll need a copy of HL2. Anyway, this is a free mod, and it's quite good.
Game play consists of an anti-monster team called IRIS and the monster is a mutated human (Subject 617) whose presence is nearly indetectable and has superhuman speed and strength. IRIS hunts the monster and the round restarts, and depending on the server, the one who killed Subject 617 might become the subject, or the one who did the most damage will. Or it might be a random server, so that even n00bs get a turn to be the subject.
It has the downside of having a lot of waiting around if you suck at it and try to be Rambo anyway. I fell in love with it immediately since the sneaking aspect of it reminded me of ThieveryUT, which I played religiously for a couple years. It's a bit weird to be standing in some shadow, while half the IRIS team runs by you, then you pick off the last one in line and super-jump away to safty while they unload all their ammo into thin air. lol
I definetly suggect checking it out.
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