HOLY FUCKING SHIT! valve has done it again... by far best shooter i've played this year. amazing very fluid game play much like CS, TFS, etc

You are a survivor and you have to get out of the city before the infected zombies kick your ass... you can play campaign, co op, vs mode, ... online play you can be either survivor/zombies. awesome concept with great execution:

http://www.xbox.com/en-US/games/l/left4dead/