SOME Xbox 1 (not One LOL) games will run on 360 IF you have a hard drive installed. It's missing tons of games (as they're being emulated and Microsoft quit developing the emulator) but it supports tons too.
It's a shame One doesn't run 1 games, if not also 360 games. You'd think Xbox One could almost run 1 games natively. Not QUITE given it would have to emulate the software environment, probably DRM, probably some GPU calls, but probably most code in 1 games would actually run on One unmodified.
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