Sure, you can get a taste of the undead from Valve's own Left 4 Dead, but maybe you want something a little different. Enter, Zombie Panic! This multiplayer game is damn cool for a number of reasons. First off, it's a more realistic portrayal of the walking dead. The infected are slow, but they can also pass the virus on to players. Typically, games start with just one zombie player who can respawn indefinitely, but as more survivors are killed, they join the other team, which turns the game into an insane struggle for survival.

Get Zombie Panic! here.