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While both downloadable and disc-based Xbox 360 and original Xbox games work on Xbox One and Xbox Series X, only selected games are supported on a case-by-case basis. Though Microsoft wound down its original Xbox and Xbox 360 back compatible efforts in mid-2019 in favour of Xbox One support for Xbox Series X - which also supports a range of improvements - there was one final update in November 2021 as part of Xbox's 20th anniversary celebrations, adding another 76 games and adding additional enhancements to existing ones.
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Xbox backwards compatibility of Xbox 360 games was Microsoft's big surprise back at E3 2015, and since debuting the feature later that year, the publisher rolled out new releases on a month-by-month basis.
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