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Data from Steam — Steam Web API Terms of Use. Last updated .
Updates & events
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 setting …