After a month of sales, Catalyst, the latest World of Warcraft expansion pack has hit 4.7 million copies–a new record that makes the title “the fastest selling PC game of all time,” according to the numbers Warcraft publisher, Blizzard. Catalyst beat out the previous record holder–Wrath of the Lich King, the previous Warcraft expansion pack. The title was released in United States, Canada, Mexico, Argentina, Chile, Europe, Russia, Southeast Asia, Australia, and New Zealand on December 7th, selling 3.3 million copies its first day. The game went on sale in Taiwan, Hong Kong, and Macau, two days later.Blizzard CEO Mike Morhaime was, naturally, rather excited at the news, We created thousands of new quests, introduced new lands to explore, and extensively revamped the game world for World of Warcraft: Cataclysm, making it our biggest and most ambitious expansion yet. We’ve been floored by the community’s response so far, and we’d like to thank them for their continued passion and support for World of Warcraft, and for helping Cataclysm reach this incredible milestone. Ahead of Catalyst’s release, WoW’s base grew to more than 12 million subscribers.