The plot is focused around Two-Face this time as he attempts to assassinate Catwoman to gain some credit in Arkham City. Arkham City was created when the Asylum as well as Blackrock Prison were deemed insufficient to hold the criminal element. The mayor then decreed that they were to block off a section of the slums and use it instead. It should feature more Riddler Challenges and puzzles. In addition all the gadgets you collected in the last game are available to you at the start of Arkham City. Arkham City will also be introducing Side Missions into the game. It should be available in the Fall of 2011.