StarCraft II: Wings of Liberty is a military science fiction real-time strategy video game deeloped by Blizzard Entertainment as a sequel to the award-winning 1998 video game StarCraft. Released on July 27, 2010, the game was developed for concurrent release on Microsoft Windows and Mac OS X. StarCraft II is split into three installments: the base game with the subtitle Wings of Liberty, and two expansion packs, Heart of the Swarm and Legacy of the Void.
Set in the 26th century in a distant part of the Milky Way galaxy, the game is built around three species: the Terrans, human exiles from Earth; the Zerg, a race of insectoid genetic assimilators; and the Protoss, a species with vast psionic power. Wings of Liberty will focus on the Terrans specifically, while the expansions Heart of the Swarm and Legacy of the Void will focus on the Zerg and Protoss, respectively. The game is expected to be set four years after the events of StarCraft: Brood War, and follow the exploits of Jim Raynor as he leads an insurgent group against the autocratic Terran Dominion. The game includes old characters from the original game, as well as introducing new characters and locations to the franchise.
Starcraft II features the return of the three races from the original game: Protoss, Terran, and Zerg. it also features approximately the same number of units as the original game. For example, the Protoss Zealot, a melee unit from the original game, now has the explorable ability to dash forward and quickly reach nearby enemies as a refinement of their speed upgrade from the original.
Units in StarCraft II have new abilities, compared to the original, that encourage more complex interaction with the game environment. Among these are the inclusion of units that can traverse varying levels of terrain, or have the ability to teleport short distances. Some Protoss units can be warped in to pylon-powered areas using the Warp Gate, a slight modification of the existing building called the Gateway.