Memorial walls-giving names & obituaries to those who have died in the infection-suggest that the game takes place in October 2009. The survivors Francis, Bill, Zoey, and Louis (left to right) on the poster for the 'No Mercy' campaignĪn outbreak of a highly contagious pathogen nicknamed the 'Green Flu' (which causes extreme aggression, mutation to the body cells, loss of higher brain functions, and essential zombification of those who catch it) begins in Pennsylvania. In July 2012, all Left 4 Dead campaigns were ported over to Left 4 Dead 2, with cross-platform multiplayer support between Windows and Mac versions of the game. A new map for both Left 4 Dead and Left 4 Dead 2, called 'The Sacrifice', was released on October 5, 2010. The popularity of the game led to the development of a sequel, Left 4 Dead 2, which was released on November 17, 2009. Left 4 Dead was released for the Mac on October 28, 2010. The second piece of DLC was charged for on Xbox Live and came in the form of a new Campaign entitled 'Crash Course,' released for both the PC and Xbox 360 on September 29, 2009. The first, called the 'Survival Pack', was released on April 21, 2009.

As was done with Team Fortress 2, Valve supplemented the game with free downloadable content. The game has won several publication awards, as well as distinctions from the Academy of Interactive Arts & Sciences and British Academy of Film and Television Arts. Several criticisms were aimed at the limited level selection and the lack of a narrative. Left 4 Dead was well received by the industry media upon its release, with praise given for its replay value, focus on cooperative play, and movie-like experience. In all modes, an artificial intelligence dubbed the ' Director' controls level pacing and item placements in an attempt to create a dynamic experience and increase replay value. There are four game modes: a single-player mode in which allied characters are controlled by AI, a four-player co-op campaign mode, an eight-player online versus mode and a four-player survival mode. Set during the aftermath of a zombie outbreak on the East Coast, the game puts its four protagonists-dubbed the 'Survivors'-against hordes of the infected. The digital retail disc version was released in North America and Australia on November 18, 2008, and in Europe on November 21, 2008. Development on the game was completed on November 13, 2008, and two versions were released digitally: A downloadable digital version, released on November 17, 2008, and a digital retail disc version, with a release date determined by region. The game uses Valve's proprietary Source engine, and is available for Microsoft Windows, Xbox 360 and Mac OS X. Left 4 Dead is a 2008 multiplayer survival horror game developed by Valve South and published by Valve.

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