BioShock is a first-person shooter video game developed by 2K Boston (now known as Irrational Games) and designed by Ken Levine. It was released for Microsoft Windows and Xbox 360 on August 21, 2007 in North America, and three days later in Europe and Australia. It became available on Steam on August 21, 2007. A PlayStation 3 version of the game, which was developed by 2K Marin, 2K Boston, 2K Australia and Digital Extremes, was released internationally on October 17, 2008 and in North America on October 21, 2008 with some additional features. The game was also released for the Mac OS X operating system on October 7, 2009 by Feral Interactive. A version of the game for mobile platforms was developed by IG Fun. A sequel, BioShock 2, was developed by 2K Marin and released on February 9, 2010.