StarCraft II is a military science fiction real-time strategy vieo game currently under development by Blizzard Entertainment as a sequel to the award-winning 1998 video game StarCraft. First announced on May 19, 2007, in Seoul, South Korea,StarCraft II is being developed for concurrent release on Windows XP, Windows Vista, and Mac OS X. The game has no certain release date although a multiplayer demonstration was playable at BlizzCon 2007.