The closed beta phase for the highly anticipated real-time strategy game, StarCraft II: Wings of Liberty has begun.

Thousands of gamers around the world have started to receive invitations from the company to participate in the first phase of the beta test. In addition to providing feedback on the multiplayer balance of StarCraft II, testers are also getting a first look at Blizzard Entertainment's revamped Battle.net service, which will be the online platform for StarCraft II, World of Warcraft, and future Blizzard Entertainment games.

StarCraft II: Wings of Liberty is the sequel to Blizzard Entertainment’s 1998 hit StarCraft, which has been hailed by players and critics worldwide as one of the top real-time strategy games of all time. Sporting a new 3D-graphics engine, StarCraft II will once again center on the clash between the protoss, terrans, and zerg, with each side deploying legions of veteran, upgraded, and brand-new unit types.