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.

Apparently, WoTLK sold over 2.8 million copies within 24 hours of launch, making it the fastest-selling PC game of all time. And it has gone from strength to strength, having sold 4 million copies total 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.”