Get Halo 5: Guardians for FREE on Xbox One.
Make an account and confirm your email address. Once you click the link they send you in your email, scroll down to “Redeem Free Download”.
You’ll then be provided a unique code to redeem to receive your copy of Halo 5: Guardians (Xbox One Digital Download) for FREE!
You can redeem the code at https://redeem.microsoft.com/ even if you don’t have an Xbox.