Left 4 Dead 2's Cold Stream DLC will launch this Friday for Xbox 360, Valve confirmed via Twitter.

"We are set for the title update and the Cold Stream DLC to be released this Friday".

The add-on is already available for PC and Mac, but was delayed for the 360.

Cold Stream was announced way back in February 2011 as the first fan-made add-on that Valve has released as DLC. The pack adds five new campaigns: Blood Harvest; Cold Stream; Crash Course; Dead Air and Death Toll.