StarCraft II: Wings of Liberty is a military science fiction real-time strategy video game developed and released by Blizzard Entertainment for Microsoft Windows and Mac OS X. A sequel to the award-winning 1998 video game StarCraft and its expansion set , the game was released worldwide on July 27, 2010. It is split into three installments: the base game with the subtitle Wings of Liberty, an expansion pack Heart of the Swarm, and a stand-alone expansion pack Legacy of the Void.