http://www.pcgamer.com/gog-giving-away-a-free-game-for-the-next-two-days/
To claim your gift, all you need to do is visit GOG's home page before June
11, 12:59pm BST, scroll down past the Bundles and Highlights sections, and
click on the free gift banner. Then, sometime after that, you'll be emailed
confirmation that Battle Realms has been added to your account.
时间只到 6/11 12：59pm
到 http://www.gog.com/ 往下拉会看到一个 A GIFT FOR YOU 就是了