via IGN

Market research company NPD Group has released its list of best-selling PC games for the week of December 7 – 13. Topping this week, once again, was Blizzard's World of Warcraft: Wrath of the Lich King Expansion. Also remaining steady was the Maxis-developed Spore, which retained its second place spot. One game to receive a significant bump this past week was Left 4 Dead. Valve's zombie-shooter rose from the previous week's eight place spot to fourth. One debut this past week was PopCap's Bejeweled Twist puzzle game. Two games that dropped out of the top 10 were Rockstar's GTA IV and Ubisoft's Far Cry 2.

1. World of Warcraft: Wrath of the Lich King Expansion Pack
2. Spore
3. Call of Duty: World at War
4. Left 4 Dead
5. Fallout 3
6. The Sims 2 Deluxe
7. The Sims 2 Apartment Life Expansion Pack
8. Bejewled Twist
9. World of Warcraft Battle Chest
10. The Sims 2 Mansion & Garden Stuff Expansion Pack

Courtesy of NPD.

It is important to note that NPD data is merely reflecting of various US retail outlet sales. The list does not encompass a variety of digital distribution figures.