Batman: Arkham City, the follow-up to 2009's hit Batman: Arkham Asylum, is scheduled to release Oct 18 2011 for US residents. If you are in Australia, the 19th and for Europe, the 21st. Rocksteady, the games developers, have said that Arkham City is five times bigger than Arkham Asylum but continues to deliver the same amazing game play we have come to love from Asylum.
