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Left 4 Dead | AndersonVision
Valve, creators of best-selling game franchises (such as Half-Life, Portal, Team Fortress, and Counter-Strike) and leading technologies (such as Steam and Source), today announced the next major downloadable content (DLC) update for its co-operative zombie thriller, Left 4 Dead (L4D), the #1 new game title on Xbox 360 and PC in 2008