https://www.polygon.com/2017/9/21/16345530/halo-3-xbox-one-backward-compatible-now-available-odst >Microsoft just made a major addition to the Xbox One’s backward compatibility library: Halo: Combat Evolved Anniversary, Halo 3, Halo 3: ODST and Halo 4 are now supported in the program, the company announced today. >Halo studio 343 Industries said in early July that support for these games was on the way. All four titles are already playable on Xbox One — Halo Anniversary, Halo 3 and Halo 4 were included in 2014’s Halo: The Master Chief Collection, and 343 released an upgraded version of Halo 3: ODST’s campaign on Xbox One in May 2015. (It was available free for some Master Chief Collection players as a make-good for the compilation’s botched launch.) The other Halo game that Bungie made, 2010’s Halo: Reach, has been backward compatible since December 2015.