Since release, we've received a ton of feedback and feature requests from the Alien Swarm community. The most requested additions are more variety and greater difficulty. With that in mind, we've added "Onslaught" mode, which introduces an AI Director that dynamically generates swarms of aliens based on several factors, such as the squad's stress level. Onslaught works with any difficulty ... more.

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... more.

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 ... more.

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 XP/Level transferring to a new player using an old player’s PC Addon VPKs get priority over base VPKs Added -override_vpk command line option to make loose files have priority over VPKs Stopped spawners shutting down... more.

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 performance issues on SynTek Residential Added Dedicated Server Browser to the main menu Cheat protected marine skill values. ... more.

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 The Vindicator’s grenade explosion effect should no longer crash users running a GTX260 graphics card. Fixed a bug where marines would continue to be buffed by the Damage Amp if they were standing in it when it expired. Fixe... more.

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 Matchmaking distinguishes between games in progress and games in the briefing Updated Hammer’s simple compile options Fixed fast reload sounds and incidental marine conversations ... more.

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 crash to desktop on certain graphics cards Fixed matchmaking sending you to the wrong mission Fixed not being able to earn the “Ammo Technician” achievement Fixed not being able to open particle systems in the edit... more.

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 weapon switch key in the 360 controller config XP and level are stored in the Steam Cloud Fixed duplicate rows in the "Find Public Games" screen Reduced screen shake when you have high ping Fixed dedicated server alw... more.

Alien Swarm is a game and Source SDK release from a group of talented designers at Valve who were hired from the Mod community. Two years ago Valve hired the talented team behind the popular top down co-op mod Alien Swarm. Since then they have been busy working on the Left 4 Dead Series, and now Portal 2. However, we never forgot about Alien Swarm and the team has spent a lot of time bringing... more.