Standalone StarCraft 2 expansion, Heart of the Swarm, has gone live meaning players around the world can begin playing.

"Heart of the Swarm enhances every aspect of StarCraft II," said Mike Morhaime, CEO and co-founder of Blizzard Entertainment. "In addition to Kerrigan's campaign and the new multiplayer units and maps, we think players will really enjoy the new online elements and new features that make StarCraft II more fun and easier to learn than ever before."

The game is available in standard, collector's and digital deluxe editions.

Heart of the Swarm picks up the story where StarCraft II: Wings of Liberty left off, focusing on Kerrigan's quest to reunite the Swarm and exact revenge on Arcturus Mengsk. The game offers 20 campaign missions, following Kerrigan as she sweeps across the galaxy, incorporating a variety of distinctive zerg species into her brood.

Source: Press release