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Assassin’s Creed: Brotherhood and Call of Duty: Ghosts are the two marquee XBox 360 titles that are currently available to you at no additional cost if you already own them. Alternatively, they can be bought via the XBox Store.
Radiant Silvergun, Blazing Angels: Squadrons of WWII, Cyber Troopers Virtual-On OT, and Wolf of the Battlefield: Commando 3 round out this lot of back compat videogames.