Batman: Arkham City Lockdown is a 2011 fighting video game developed by NetherRealm Studios and published by Warner Bros. Interactive Entertainment. Based on the DC Comics superhero Batman, it is a spin-off to Batman: Arkham City, and the first mobile game in the Batman: Arkham series. Set a few weeks before Arkham City, Arkham City Lockdown follows Batman as he attempts to capture several villains who have escaped from Arkham Asylum and are causing mayhem in the streets of Gotham City. As Batman, players fight enemies using melee combat, and earn points for doing so, which can be used to upgrade Batman's stats or to unlock gadgets and alternate costumes.