2D action-stealth game Serial Cleaner is free for a limited time through the Humble Store. The game normally costs 14.99 euro but for the next 72 hours you can get it for free.
To get the game, just go to the Serial Cleaner page on the Humble Store, and click "Get the Game". Once you get the game, it will be yours forever. The offer ends on Sunday, November 24 at 10 a.m. PT. But be careful, because the game cannot be redeemed after November 28.