One of the most interesting things about Valve's upcoming zombie pandemic shooter Left 4 Dead is the way the game is structured. Instead of a single story that follows one player from beginning to end, Left 4 Dead is divided into four "movies," which are essentially minicampaigns intended to be played over and over with the aid of four-person co-op and a remarkable AI system that assure no two experiences are the same. Up until this point, Valve has shown only
two of the game's movies, the hospital-focused No Mercy and a run through the woods called Blood Harvest, but we recently had the chance to play through a third: Dead Air.
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