Blizzard Entertainment has announced that World of Warcraft's second expansion, Wrath of the Lich King, sold more than 2.8 million copies in its first day on sale.
According to the developer, sales eclipsed the 2.4 million the previous expansion, The Burning Crusade, achieved on its first day - making Wrath of the Lich King the fastest-selling PC game of all time.
"We're grateful for the incredible support that players around the world have continued to show for World of Warcraft," said Mike Morhaime, CEO and cofounder of Blizzard Entertainment.
"Wrath of the Lich King contains some of the best content we've created for the game so far, and we look forward to seeing even more players log in to experience it in the days ahead."
Retailers worldwide held extravagant midnight launch events for the expansion pack, with more up to 2000 people attending the opening at HMV's flagship store on Oxford Street in London.