Blizzard's World of Warcraft: The Burning Crusade has becomes the second fastest-selling PC game in chart history, taking the number one spot in the All Formats charts and accounting for 30 per cent of all PC game sales last week.
The expansion pack was released on 16th January, with midnight launch events held at stores throughout Europe.
In a week of sales that saw no other games released, the rest of the top ten has shuffled around to accommodate the new entry.
Capcom's Xbox 360 exclusive Lost Planet: Extreme Condition has dropped a single place to number two, as has Nintendo's Wario Ware: Smooth Moves at number three.
Football rivals FIFA 07 and Pro Evolution Soccer 6 sit at numbers four and five, respectively, while number six sees the top ten entry of Sega's World Snooker Championship 2007, climbing from number 17.
Need for Speed: Carbon is at number seven, just ahead of Call of Duty 3 at eight, The Sims 2: Pets at nine and Rockstar's Canis Canem Edit at ten.