Batman: Arkham City Lockdown

A spin-off game entitled Batman: Arkham City Lockdown was developed by NetherRealm Studios for iOS and released on December 7, 2011. Set before Arkham City, the game lets players use touchscreen controls to fight enemies, including villains such as Two-Face, Solomon Grundy, Joker and the mercenary Deathstroke. Defeating enemies earns you points that you can use to improve Batman's stats or unlock gadgets and costumes.