https://www.gamespot.com/articles/xbox-one-adds-new-backwards-compatible-game/1100-6458715/

Dragon Age II still has many fans seven years after its release, and now players will get another chance to play as the game is now part of the Xbox Backwards Compatibility program. Starting today, you'll be able to buy a digital copy of the game on Xbox One or, if you have the Xbox 360 disc already, pop it in your Xbox One and start playing for free.

Dragon Age II came out in 2011 and is a complex role-playing game with expansive questing, twisting narratives, and lots of adventure in an vast fantasy world. It has many of the hallmarks of the traditional fantasy RPG; you fight dragons, level up your skills, and assemble your party. Much like Mass Effect 2, which was also developed by BioWare and came out the year before, you choose how you respond to events in the game by using a dialogue wheel. Some interactions greatly affect gameplay and plot down the road.