Assassin's Creed Unity for PC currently is free to grab at Ubisoft, the 2014 game has a setting. The free game does have a twist, the game takes place in France and even features a fairly detailed version of the famed Notre Dame cathedral.

In light of the devastating fire at the Notre Dame de Paris, Ubisoft wants to give all gamers the chance to experience the majesty and beauty of the cathedral through Assassins Creed Unity on PC, free of charge, from April 17th at 04:00 pm to April 25th at 09:00 am

Ubisoft will also be donating €500,000 to help with the restoration and reconstruction of the Notre Dame Cathedral. This promotion is limited to PC users with Ubisoft's Uplay client installed. Simply follow this link and click on the PC download link at the bottom. Like always, this promotion is only for a limited time. From April 17th at 10:00 am to April 25th at 03:00 am (your local time), users will be able to claim a copy. Although the window of claiming a copy is limited, once it is already tied to your Uplay account, the game is yours to keep forever. 

From April 17th at 04:00 pm to April 25th at 09:00 am (your local time). you can download Assassins Creed Unity on PC for free here, and you’ll own it forever in your Uplay games library.  

Just add the game un Uplay.