Memorial walls-giving names and obituaries to those who have died in the infection-suggest that the game takes place in October 2009. Plot 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 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.

The success of the game led to the development of the sequel Left 4 Dead 2, which was released in 2009. As was done with Team Fortress 2, Valve supplemented the game with free downloadable content. Considered one of the greatest video games ever made, the game won several publication awards, as well as distinctions from the Academy of Interactive Arts & Sciences and British Academy of Film and Television Arts. Left 4 Dead was well-received by the industry media upon its release, with praise for its replay value, focus on cooperative play, and cinematic feel, although some criticized its limited level selection and lack of narrative.

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. Left 4 Dead uses Valve's proprietary Source engine, with 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 of the United States, the game pits its four protagonists, dubbed the 'Survivors', against hordes of the infected. It was originally released for Microsoft Windows and Xbox 360 in November 2008 and for Mac OS X in October 2010, and is the first title in the Left 4 Dead series. Left 4 Dead is a 2008 first-person shooter game developed by Valve South and published by Valve.

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