Another free weekend event has kicked off on Steam, and this time it features the still-in-development Killing Floor 2.

　　The cooperative zombie shooter is currently free to download and play as much as you want on PC until Sunday, September 6, at 10 AM PDT.

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　　Killing Floor 2 - Incinerate ‘N Detonate Trailer

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　　This is the full version of the game as it currently exists in early access, and includes all of the content released as part of a major free update earlier this week. It added two new perks (the game's parlance for classes), the Firebug and Demolitions; new weapons and grenades for each of those perks; two new maps; an overhauled skill tree for the Berserker; new achievements; support for Nvidia's PhysX Flex tech; and more.

　　Alongside this update, new crossover promotions were introduced. If you own Chivalry on Steam, you'll now have access to a playable Knight character and the Zweihander sword. If you own Red Orchestra 2, Anton Strasser is now available as a playable character.

　　Coinciding with the free weekend event, the game is 33 percent off, bringing its price down from $30 to $20. There's also a six-pack on sale for $100, bringing the price of each copy down to under $17. These prices are available until Monday, September 7, at 10 AM PDT.

　　Killing Floor 2 remains in early access. If you've been unsure about dropping money on the game before its full release, this is an ideal opportunity to give it a spin.