In StarCraft II: Heart of the Swarm, you must help Sarah Kerrigan fight her way through a vast single-player campaign that will take you to some of the most dangerous worlds of the Koprulu sector in the Milky Way.
Missions
Heart of the Swarm’s campaign includes 20 new missions for StarCraft II covering the Zerg story. Every mission has a unique gameplay starting from simple ones like gathering resources, building an army, and attacking or defending to complex missions like infiltration, stealth or mass destruction.
Evolving Through the Campaign
Players can evolve their swarms with unique, campaign-only units and abilities, and this evolution happens in an organic manner befitting of the expansion’s Zerg theme.
Gaining Skill Points
As you progress through the story, you will evolve your character, Sarah Kerrigan, and her brood into deadly predators. Gain skill points through the missions by completing objectives and then spend your skill points to learn new abilities and mutations that allow you to create dozens of unique unit combinations.
Customizing your Swarm
After every couple of missions, you will be given a chance to select one of the two genetical creature strains. Once you've selected one of the two major unit evolutions you cannot undo or change it.
Before selecting one of the two evolution strains, you can play an evolution mission and test them to see which one pleases your tastes. There are a total of 7 evolution missions that allow you to do this.
