"Fight together! Or die alone..."
An unknown virus is paralyzing humanity at an incredible speed. Those infected become extremely aggressive psychopaths who attack sane people. You are one of the 'lucky ones' who has developed immunity to this nightmarish disease. Shoulder to shoulder with other survivors like you, you must escape from the city populated by thousands of crazed infected. Will you band together and fight your way out of this horror, or will you die alone, panicking and unable to withstand the onslaught of the zombie army?
The game was created by the authors of Counter-Strike and is based on one of the latest versions of the legendary Source engine. In addition to unforgettable, bone-crushing yet tense gameplay with perfect balance, the game features advanced artificial intelligence technologies and sound design. The ingenious addition of a 'virtual director,' which automatically tracks player behavior and levels, allows players to revisit the game with enjoyment time and again – for every time, events unfold differently.