Rainbow Six Siege Coming to Xbox Game
It has been officially confirmed that Rainbow Six: Siege will soon be available in Xbox Game subscription service, enabling us to play it even on Android-based smartphones.

Microsoft the xCloud service, which is available to subscribers of this subscription.
Rainbow Six: Siege was launched on December 1, 2015 on PC, PlayStation 4 and Xbox One. It will also appear on PS5 and Xbox Series X/S in November this year. The game boasts over 60 million ed players.
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