World of Warcraft, the massively multiplayer online role-playing game has surpassed 5 million customers worldwide, according to its creators Blizzard. Seemingly the world's most popular MMORPG, World of Warcraft continues to exceed the expectations of Blizzard, who claim it has a strong presence across Asia, Australia, Europe, and North America. The game has an add-on pack, World of Warcraft: The Burning Crusade, set for release next year.