Kingdom Under Fire: Circle of Doom is an Action RPG video game developed by Blueside and published by Microsoft Game Studios exclusively for the Xbox 360. It is the fourth installment in the Kingdom Under Fire series and the first released for the seventh generation of consoles. Chronologically the game's story follows Kingdom Under Fire: The Crusaders released in 2004 and its prequel Kingdom Under Fire: Heroes released in 2005. It was first released in Australia on December 5, 2007, followed by Japan on December 13, 2007 then later in North America om January 8, 2008 and in Europe on February 1, 2008.
Unlike the previous Kingdom Under Fire games in the series, Circle of Doom's gameplay is significantly different, with the real-time strategy elements completely absent, with much of the gameplay focus being on the role-playing and hack and slash combat aspect.