Valve will release Dead Air from the upcoming Cold Stream Left 4 Dead 2 DLC on 22nd July if 20,000 people can earn the Stream Crosser achievement by the end of this Sunday. Obtaining the Stream Crosser achievement is extremely simple as all you need to do is survive a campaign of Cold Stream on any difficulty. So if you haven’t yet got the aforementioned achievement then now is a good a time as any to get it and you might gain early access to a piece of DLC in the process.
Taking to the L4D blog Valve wrote, “Normally on an internal project we would have the whole company take a part of each day and do nothing but play the upcoming game or DLC and submit bugs. To add to the fun we often give out prizes for participating. Since Cold Stream is not just being developed internally but also with the community – we want the community to help pound on the campaign and look for bugs.”
The Cold Stream DLC, which has been in beta testing for a few months now on PC and Mac, is a collaborative project between Valve and the Left 4 Dead community. It began life as a community campaign created by modder Matthew Lourdelet before it was brought to the attention of Valve who then decided to jump in, put their touch on it and give it a full release.