Blizzard has just sent word of the record breaking launch of the World of Warcraft expansion Cataclysm.

In the first 24 hours on sale it sold over 3.3 million copies, becoming the fastest selling PC game of all time.

"We had to bring Azeroth to the brink of destruction in Cataclysm, but the result was our best expansion yet," said Mike Morhaime, CEO and cofounder of Blizzard Entertainment. "We want to thank all of our new, existing, and returning players throughout the world for their incredible enthusiasm and support, and we look forward to hearing what they think about all the new content."

The previous record holder was the previous expansion - Wrath of the Lich King - which shifted 2.8 million units in the same period.