The "Survival Pack" downloadable content for Valve's cooperative zombie shooter Left 4 Dead will be free for both PC and Xbox 360 players, the company confirmed today.
Due out this spring, the download will add a new Survival mode, in which players attempt to survive endless hordes of zombies on at least 12 maps, and allow the Dead Air and Death Toll campaigns to be played in the competitive multiplayer Versus mode.
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