The Witcher 2: Assassins of Kings (Polish: Wiedźmin 2: Zabójcy królów) is an action role-playing hack and slash video game developed by Polish studio CD Projekt RED for Microsoft Windows, Xbox 360, OS X and Linux. The game was released internationally for Microsoft Windows on 17 May 2011 and for Xbox 360 on 17 April 2012.It is a sequel to the 2007 video game The Witcher. Like its predecessor, the game is based on The Witcher series of fantasy novels by Polish author Andrzej Sapkowski.