After the cancellation of Evolve’s support by their publisher 2K, developers Turtle Rock Studios seem to have had a little spare time. They’ve used the time to do up and release an unfinished campaign for the original Left 4 Dead game that was scrapped before the game’s release as an add-on in 2008.

The Dam It campaign (which shares its name with an unrelated single-map mod released in 2009 by Tom Baldry) is a multi-map stroyline that takes the four players of the game from a crashed C-130 plane on an airfield to a hydro-electric damn, fighting zombies all along the way. The developers had intended the finale of the campaign to be different to the other campaigns by having the party needing to be split instead of all focused in one spot fighting off waves in a hold-off until time has elapsed situation. Other elements include an apple orchard, a graveyard of crawling zombies, a ravine and even a set of fuel storage building that would trigger alarms if fire-based weapons were used inside – bringing the zombies right towards you.

Obviously as an old scrapped campaign, you can expect a few things not be working fully. The fire alarms for example aren’t fully implemented. The maps are playable though and mostly completed, so getting them to work isn’t going to be a big issue. If you fancy giving it a go with some friends, grab the download here.