Zombie Panic! Source is a standalone cooperative, survival-horror, first-person-shooter! Set in the middle of a zombie apocalypse, players start as a small group of survivors attempting to stay alive. Each map will have its own objectives to complete and win the round or survive by a period of time.
ZPO_Epic - By Knights
Looking nice, great one. And not way too much "Half-Life"... ;)
The thing in the poster looks like a halloween headcrab :P
realistic like a movie theatre