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The first batch of original Xbox games to get the Xbox One backwards compatibility treatment were announced today. There are 13 games to kick things off, which are announced below along with some new Xbox 360 games plus visual comparisons.

When you think about it, it makes sense that the Xbox One can play Xbox 1 games.
And to help celebrate the launch of Original Xbox games into the Xbox One Backward Compatibility library, Xbox Game Pass members get access to Xbox Original Ninja Gaiden Black for free as a part of their membership to the game subscription service