OnLive is offering a FREE OnLive Game System ($99 value) or Full Pass Game when you pre-order Batman Arkham City Full PlayPass for $49.99 for a limited time. PlayPack Subscribers get a 30% discount, $34.99 to preorder.

The game system includes an OnLive MicroConsole TV adapter, wireless controller, rechargeable controller battery, cables, and more. Deal expires September 14, 2011 or while supplies last.

Batman: Arkham City builds upon the intense, atmospheric foundation of Batman: Arkham Asylum, sending players soaring into Arkham City – five times larger than the game world in Batman: Arkham Asylum – and 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.