is a free top-down shoot-em-up by Valve Corporation.

It is a remake of the Alien Swarm mod for Unreal Tournament 2004, and it was developed by the original team after they were hired by Valve.

Official Site[www.alienswarm.com]
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RECENT ANNOUNCEMENTS

[EN] Alien Swarm Update Released (August 9)

11 August, 2010 - [KICK] DiCHANHO | 0 Comments

Updates to Alien Swarm SDK have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Alien Swarm SDK
Alien Swarm Authoring Tools updated with support for mod configurations

[EN] Alien Swarm Update Released (August 5)

11 August, 2010 - [KICK] DiCHANHO | 0 Comments

Updates to Alien Swarm have been released. The updates will be applied automatically when your Steam client is restarted. The major changes include:

Alien Swarm
Fixed Assault Jets using up more than one charge when you have high ping
Fixed HLMV material loading when running a mod
Fixed a Steam cloud bug in the SDK source code