Batman: Arkham Asylum is a 2009 action-adventure video game based on DC Comics' superhero Batman. Released for the PlayStation 3, Xbox 360, Mac OS X and Microsoft Windows, it was developed by Rocksteady Studios in the United Kingdom and published by London based Eidos Interactive in conjunction with Warner Bros. Interactive Entertainment. The PS3 and Xbox 360 versions of the game were released on August 25, 2009 in North America and August 28, 2009 in Europe, and the PC version was released on September 15, 2009 in North America and on September 18, 2009 in Europe. The Mac OS X version of the game was released by Feral Interactive in November 2011.