Microsoft wants your input as to what should show up next in their library of backwards compatible Xbox 360 games. Backwards compatibility allows Xbox One gamers to play select Xbox 360 games on their newer console. The company is making no promises about availability, but it is currently taking gamer feedback through their UserVoice site:

With new games added to the roster every month, now you can play both generations of games on one console. Experience the greatest games lineup in Xbox history — exclusively on Xbox One. We can't promise every title will be available, but we're working hard to make as many of your favorite Xbox 360 titles playable on Xbox One.

With 6,656 votes, Call of Duty: Black Ops II is currently the most popular game among users. When announcing the feature at E3 2015, Microsoft said that all developers would have to do would be to authorize their game for backwards compatibility.

Xbox One backwards compatibility will first be available for Xbox Preview members, who can play any of the first 21 compatible games. The feature will come to all Xbox One owners later this year, and Microsoft hopes to have more than 100 titles in place by that time.

Source: Microsoft