Batman Arkham City Cd Key is available on cdkeysdirect.com  You have to use the cd key with the game dvd and the game uses games for windows live account.

Batman: Arkham City builds upon the intense, atmospheric foundation of Batman: Arkham Asylum, sending players soaring into Arkham City, the new maximum security home for all of Gotham City's thugs, gangsters and insane criminal masterminds.

Set inside the heavily fortified walls of a sprawling district in the heart of Gotham City, this highly anticipated sequel introduces a brand-new story that draws together a new all-star cast of classic characters and murderous villains from the Batman universe, as well as a vast range of new and enhanced gameplay features to deliver the ultimate experience as the Dark Knight.