GTFO Free Weekend

A free weekend is underway on Steam for GTFO, offering the chance to sample this horror-themed first-person shooter or, well, GTFO. The game is on sale for half off if you decide you want to pick it up. This post has a free weekend FAQ, and here's a refresher on the game:
Your team of prisoners is dropped into the Rundown when a new Work Order is issued by The Warden, the mysterious entity holding you captive. The Rundown is a series of expeditions, each one taking you deeper into a decayed research facility called The Complex. You descend level by level, scavenging tools and resources that help you survive in a perilous network of tunnels where gruesome creatures lurk in every shadow. Complete all the expeditions to fulfill the Work Order and clear the Rundown.