After a year and a half , in spite of the famous " Valve time ", 24 July on both PC and Xbox 360 will be issued additional content of Left 4 Dead 2 called " Cold Stream " which will add campaigns in single and multiplayer games maps Blood Harvest, Crash Course, Cold Stream, Dead Air and Death Toll . The DLC should get free on the marketplace, but for the moment Valve does not gave no certainty and certainly in the next few weeks will be clarified these and other doubts.

The same DLC, besides the maps already mentioned, there will be room for different surprises withheld until today. One of these will be the availability of all Mutations (the famous events a time released weekly) as single mode to play when and how you prefer: players can then choose to try Mutations as Taannkk! , Gibfest and many others. Valve turns on a summer full of zombies, except more last-minute delays.