Blizzard Entertainment has announced that World of Warcraft, its incredibly popular MMO, is now played by more than 11.5 million subscribers worldwide. The landmark was aided by the November 13 release of WoW's second expansion, Wrath of the Lich King.

According to Blizzard, Wrath of the Lich King sold more than 2.8 million copies within its first 24 hours of availability, making it the fastest-selling PC game of all time. The expansion has gone on to sell more than 4 million copies in its first month.

"We're pleased to welcome the new and returning players who have helped World of Warcraft reach these new milestones, and we appreciate the enthusiasm and support that the game's global community has continued to show," said Mike Morhaime, CEO and cofounder of Blizzard Entertainment. "We look forward to providing all of them with an excellent entertainment experience for a long time to come."

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