It may not be the most exciting freebie but Ubisoft is currently giving away PC copies of Assassin’s Creed Chronicles: China over on the Ubi store.
AC Chronicles: China is a 2.5D spin-off of the Assassin’s Creed series, and one of three such Chronicles games that also include AC Chronicles Russia and India.
All you need to do is head to the Ubisoft store, log-in to your Uplay account and add Assassin’s Creed Chronicles: China to your Uplay library. Nice and simple.
Some folks are reporting that the checkout process doesn't work through the site though, so your back-up option is to grab it through the Uplay application itself.