Console Monster writes: "Microsoft is rewarding their fans with a free copy of Killer Instinct for the Xbox One.
An email sent to a number of users said: “You’re a fan of ours and we’re a fans of yours. Thank you for your dedication to Xbox. We want to show you our appreciation, so we’re giving you: Killer Instinct.”
Recipients of the email were told to “watch [their] inbox on 22 November for instructions on how to claim [their] free gift.”"
Microsoft has confirmed that the game was offered to those with "a high GamerScore or a Live tenure".