NPD Group today announced the top 20 PC games sales ranking in North America for December 2008. This month, the first place went to Blizzard's MMORPG "World of Warcraft: Wrath of the Lich King". This game has occupied the top spot in the top 20 in North America for two months, but the launch date in China is still undetermined. The rankings this month continued the usual trend, with Blizzard and EA dominating the PC platform. Six of the ranking positions were occupied by "The Sims 2" expansion packs, indicating that "The Sims 2" is very popular among players in North America.