Fallen Earth from the official store before January 13th. No, it doesn't make the post-apocalyptic wasteland of the game any more apocalyptic, but it does mean that you can get a free copy for a friend to buddy up alongside you for the low price of just $14.99.
The limited-time offer drops the price of each copy below eight dollars while simultaneously giving players a free month of game time. And the recipient of the free copy receives all the same perks, including the special in-game item (either an ATV or a very fetching hat). So if you've been itching to try out Fallen Earth and want to have someone at your back while you explore the wasteland, now is the perfect opportunity.