System Shock 2 is a first-person shooter action role-playing survival horror video game for Microsoft Windows, OS X and Linux. The title was designed by Ken Levine and co-developed by Irrational Games and Looking Glass Studios. Originally intended to be a standalone title, its story was changed during production into a sequel to the 1994 PC game System Shock; the alterations were made when Electronic Arts—who owned the System Shock franchise rights—signed on as publisher.