https://www.polygon.com/2018/4/10/17221216/xbox-one-x-enhanced-xbox-360-games-red-dead-redemption-gears-2-sonic-generations

Six more Xbox 360 games that are backward compatible on Xbox One are getting enhanced updates — like improved pixel count and enhanced color depth — on Xbox One X, Microsoft announced during a livestream today. Those new Xbox One X-enhanced titles include Rockstar Games’ open-world Western Red Dead Redemption and Epic Games’ third-person shooter Gears of War 2.

Sega’s Sonic Generations, which was originally released on Xbox 360 in 2011, also joins the list of backward compatible games — and it too is now Xbox One X enhanced.