Warner Bros Interactive Entertainment and DC Entertainment have launched a brand new update for Batman: Arkham City Lockdown App for the iPad, iPhone and iPod touch. The update features a brand new level for the game involving Harley Quinn, a new Bruce Wayne skin and achievements. Best of all the update is free to everyone, though if you do have some money burning a whole in your pocket then you can purchase the Batman Inc. skin for cash. The new Harley Quinn level expands Gotham City with new gameplay. As Bruce Wayne's Batman you must do battle with Harley themed henchman as you attempt to take The Joker's mistress down. There is also a feature included where you use Batman's Batarangs in a timed showdown. You can watch the Harley Quinn Batman: Arkham City trailer below and also check out the brand new screenshots. If you do download this new Batman: Arkham City update then please let us know your thoughts and review in the comments below!