Turtle Rock have announced that a previously unreleased campaign for Left 4 Dead called Dam It is now available for download online.
On the Turtle Rock forums MacMan wrote: "Just finished putting the Dam campaign that we streamed a while back into a L4D addon. It's gray box, and some code features are missing but it's playable from beginning to end. It also includes two standalone survival maps that never shipped."
A quick visit to the web page for the campaign, however, reveals there are a number of known issues with it, including dam spawn room missing health kits and weapons, farm house mob does not spawn in the far side of the woods and the burning forest section having a burn trigger that stays on for too long, among others.
Also on the page is a map of the layout for the new campaign. Which is your favourite Left 4 Dead campaign?