The team wanted to make a full experience out of this mod, and the zombie apocalypse was a perfect fit.
This gameplay featured a small group of counter terrorists armed with weapons fighting off hordes of knife wielding terrorists. The original concept for Left 4 Dead was based on a Counter-Strike mod called Terror Strike. The game pits four human survivors of a zombie apocalypse against hordes of the undead as they attempt to reach safety or evacuation in Campaign mode, and in Versus another four players as the undead. Left 4 Dead was released on November 18th, 2008 in North America and worldwide through Steam on both the PC and Xbox 360.
Running on the Source Engine, Left 4 Dead is a multiplayer cooperative first-person shooter developed by Turtle Rock Studios, Certain Affinity and Valve Corporation.
