L4D is probably the best zombie video game, but L4D is mainly an incredible coop experience. Everything in the gameplay is made so you need your friends to overcome the endless hordes of zombies

Mother of Mercy! The Source engine with some updates made specifically for this game still rocks on bringing a unique co-operative experience best had with 3 close friends.

Starring with 3 friends in a classic zombie movie is a killer experience and the action will take you through major adrenaline bumps. It's just too bad the matchmaking sucks so hard...

THE n°1 game for all zombie lovers/frag maniacs with an inch of strategy, stress and skill needed - whether you're on the survivors' or infected's side!Too bad the lobby is as lousy as it gets tho :/

A standalone mod of HL2 at first, and a pretty good FPS with its own kind of tactics and strats after a few games. For blood proof keyboards and mice.