Wings of Liberty focuses on the Terrans, while the expansions, Heart of the Swarm and Legacy of the Void, would focus on the Zerg and Protoss, respectively. Like its predecessor, the game revolves around three species: the Terrans (humans), the Zerg (a super-species of assimilated life forms), and the Protoss (a technologically advanced species with vast psionic powers).
Wings of Liberty has been free-to-play since November 2017. A sequel to the 1998 video game StarCraft and the Brood War expansion pack, the game is best known as the original installment of StarCraft II which was later followed by a number of expansion packs. It was released worldwide in July 2010 for Microsoft Windows and Mac OS X. StarCraft II: Wings of Liberty is a science fiction real-time strategy video game developed and published by Blizzard Entertainment.