Hello everyone!
We want to let everyone know that Alien Swarm: Reactive Drop will include significantly improved versions of Tears for Tarnor and Lana's Escape campaigns as official campaigns.
These are the two of the best user created campaigns for Alien Swarm. The original authors worked really hard to improve and balance maps since the last public release. We are working on adding single-player support for these campaigns.
Below are some screenshots which can also be seen on our store page: