Blizzard’s MMO juggernaut “World of Warcraft” is showing no signs of slowing down. Wow-Cataclysm

The company announced Monday that the game’s latest expansion – “World of Warcraft: Cataclysm” – had sold 4.7 million copies worldwide in just one month. That makes it the fastest-selling PC game of all time, displacing “Wrath of the Lich King,” the previous "WoW" expansion.

Now in its seventh year, the franchise boasts more than 12 million players and has consistently outperformed other PC titles at retail.

“’World of Warcraft: Cataclysm’ [was] our biggest and most ambitious expansion yet," said Mike Morhaime, CEO and cofounder of Blizzard Entertainment. "We’ve been floored by the community's response so far.”

The title was a hit out of the gate, selling 3.3 million copies on its first day. (To put that in perspective, sales of the “Lich King” expansion hit 2.8 million on their first day.)

The sales bump from the expansion’s hot sales isn’t a one time event, either. Players are required to pay a $15 monthly subscription fee in most regions, making it one of the most reliable sources of income at Activision-Blizzard, despite growing competition in the market.

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