Wolfire Games recently took a break from Overgrowth to participate in the 7-day FPS Challenge and the results have been fairly impressive. In this not-quite-free chunk of first-person goodness from Wolfire, players will get to unravel the secrets of Mindkill as they progress through a labyrinth of shock drones and automated turrets. Receiver features perma-death and some of the most realistic-looking gun mechanics that I've seen yet. It's currently available for $4.99. However, if you're already an Overgrowth customer, you will be getting it for free.

Official website here.