If you've never played Tripwire Interactive's Killing Floor, you can pick it up free at the Humble Store until tomorrow.
The Steam Summer Sale may be in full swing, but the folks over at the Humble Store have an enticing offer of their own. Until 1 PM ET tomorrow, you can get Tripwire Interactive's zombie shooter, Killing Floor, absolutely free.
All you need to claim a copy is a Humble account. If you've ever purchased a Humble Bundle, you've already got one. Head over to the Killing Floor store page, log in, and claim your copy. You'll get a Steam code that you can redeem for your copy of the game.
It's worth noting that you have to redeem the code you receive by 1 PM ET on Saturday, July 8th, 2017, or it will not work. That means you shouldn't delay. There are plenty of other shooters on sale as well, so check out the Humble Store for all the deals.