Doom II RPG is the sequel of Wolfenstein RPG, set after Doom RPG (November 20, 2146). It was released for mobile phones on November 23, 2009 and for iPhones on February 8, 2010. It uses the Wolfenstein RPG engine and was developed by id partners Fountainhead Entertainment via the merger id Mobile. There are three playable characters: Sergeant Stan Blazkowicz (descendent of William "B.J." Blazkowicz), Major Kira Morgan and a scientist Riley O'Conner.