"Now, obviously there have been many games with zombies in, but in most cases they're just standard challenge obstacles to litter the corridors, interchangeable with terrorists, or aliens, or mean-spirited traffic barriers. The trick is to recreate the tension and emotion of the zombie apocalypse, where you and the last three sane people on Earth huddle in a basement together somewhere, while the entire population of the landmass stands outside, meaningfully rubbing their bellies and waving ice cream scoops."
- Left 4 Dead review