GameStop's Batman: Arkham Asylum Page outlines a preorder bonus for Batman: Arkham Asylum, Rocksteady's upcoming superhero game. The bonus applies to the Windows and console editions of the game, which also carry a street date guarantee that will have the game delivered on its release date of August 25, though they add: "Not responsible for orders delayed due to inclement weather, incorrect address, credit card information, or because the postman was distracted by Joker in a nurse's uniform." The bonus is an exclusive Challenge Map called "Dem Bones," which "pits Batman against Scarecrow's army of skeletons. In true core gamer fashion, this map is among the most difficult Challenge Maps that the gamer will face as Batman." The bonus is available to UK gamers through GAME.co.uk.