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Left 4 Dead is a first-person shooter in which the player takes control of one of four survivors; if human players are not available, then the remaining survivors are AI-controlled bots.They play through the levels fighting off the infected—living humans who have been infected with a rabies-like virus that causes psychosis.Despite this apparent rescue, it crashes as well, and the survivors once again find themselves alone on the outskirts of Allegheny National Forest.Following a series of train tracks through the area, the group find themselves at a functioning, but abandoned, military outpost.As was done with Team Fortress 2, Valve supplemented the game with free downloadable content.
Upon arrival, the group see that in an attempt to contain the infection, the military had bombed the airport while infected pilots crash planes in an attempt to land; the runway however is largely intact, allowing the survivors to fuel up and escape in a waiting C-130.
In all modes, an artificial intelligence (AI), dubbed the "Director", controls level pacing and item placements, in an attempt to create a dynamic experience and increase replay value.
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.
Fighting their way through the city's streets, subway and sewers, they are rescued from the hospital's roof by the pilot, only to discover he is infected.
With Zoey forced to kill him, the helicopter crash lands in an industrial district outside the city.