Valve has announced downloadable content for Left 4 Dead 2.
The Passing will be set in a small rural town in Georgia, as the cast of the game meet the survivors of the original Left 4 Dead.
As well as new arenas for Survival, Versus and Scavenge, it will introduce a new co-operative mode. A new firearm, melee weapon and uncommon infected will also be added.
It has been given a spring 2010 release date for both PC and Xbox 360.
Price details are yet to be confirmed.
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