The game is the sixth in the series after several spin-offs as well as a MMORTS. It is the sequel to Stronghold, released in 2001, and Stronghold 2 released in 2005. Unlike previous games in the series which were published by Take-Two Interactive, the game will be published by SouthPeak Games who published Stronghold: Crusader Extreme in 2008, the remake of Stronghold: Crusader.Firefly Studios had previously claimed in 2008 that they would be working on Stronghold 3 then Crusader 2 due to the high demand by fans but only after the completion of Dungeon Hero. However, in 2010 the status of Dungeon Hero is uncertain after being delayed numerous times. In 2009 when asked if they had any other unannounced game in development other than Dungeon Hero and Stronghold Kingdoms, the answer was that they still had one more game in development. The game was further teased in 2009 when Firefly stated in their newsletter that they had "something very big in the pipeline" which would be revealed in 2010, this game would later turn out to be Stronghold 3.