This mod needs to be cleaned up to meet the standards of the Mod Template.
The latest version of the campaign, Delta 1.2, can be found here: http://lambda-l4d.webs.com/downloads.htm. Note that since the campaign uses content from Half-Life: 2, you will need to own the game and the content will, at present, need to be extracted manually. See http://lambda-l4d.webs.com/contentextractionguide.htm.
An early alpha trailer of the campaign can be found here: http://www.youtube.com/watch?v=wm6dhQrvmkc.
The current poster for the Lambda campaign. See http://lambda-l4d.webs.com/ for more information.