Following the release of the Xbox One and transition of Phil Spencer to the head of the Xbox division in 2014 , he and software engineering vice president Kareem Choudhry restarted the backwards compatibility program in relative secret within the company . Choudhry brought on previous engineers that worked on Trioxide , including Kevin La Chapelle , Jonathan Morrison , and Barry Bond , to restart the program . The team chose to start with '' Castle Crashers '' , which included Xbox networking features , to test backwards compatibility . '' Castle Crashers '' frequently crashed to a screen with alphanumeric codes , which La Chapelle was able to obtain from the game 's developers , The Behemoth , which helped them to rapidly diagnose problems and fix the compatibility issues . Solving most of the major problems through '' Castle Crashers '' , the background compatibility team decided to let the program be announced at E3 2015 with plans to have one hundred titles available by the end of 2015 . However , by E3 , they still found problems with some games running at extremely low framerates . During the event , Morrison recognized that a fundamental difference between the Xbox 360 and Xbox One was its scheduling rate , and when they returned , Morrison 's idea helped them to rapidly complete work to meet its promised goal by the end of that year . Individual games still brought some difficulty , specifically '' Halo : Reach '' , but this prompted the team to develop automatic tools that could be used to identify where Xbox 360 titles would be difficult to run as-is on the Xbox One and how to work around those ; this further set up the potential to improve Xbox 360 games on the future iterations of the Xbox One , such as the Xbox One X to improve graphics support
E3 2015
E3 2015
Xbox One