Back 4 Blood - Expansion 1: Tunnels of Terror

It's already a part of the game. Buying it is just like buying a validation key to unlock it. Ignore the "can't download" because you simply don't. As long as you updated your game, it's there.

Already included in game via tunnels update

its not Left 4 Dead and that's fine but this game is still good as its own thing and definitely fun

To everyone saying they can't install, the content is already installed from updates. Buying this gives you access to it. Stop leaving bad reviews because of your stupidity. Lol. Just load up the game, all content is there.

I've owned this and have played since early release and have enjoyed every minute. I got this just as I've gotten world war z because they're just fun coop zombie shooters that aren't left 4 dead have clear inspiration from them.