StarCraft II is a science-fiction real time strategy game released by Blizzard in 2010. It is the long-awaited sequel to StarCraft (1998). The game is critically acclaimed for its storytelling and range of features and became free-to-play in 2017. At its release, NZGamer.com called it “the best RTS game released in years and one of the best games on PC”. The basic game concept is to build an army and destroy the enemy base. There are three species in the game: Terran, Zerg and Protoss. The base game, Wings of Liberty focuses on the Terrans, while the expansion packs, Heart of the Swarm (2013) and Legacy of the Void (2015) are focused on the Zerg and Protoss species.