1. World of Warcraft: Burning Crusade - Blizzard - 2.25 million 2. World of Warcraft - Blizzard - 914,000 3. The Sims 2 Seasons Expansion Pack - Electronic Arts - 433,000 4. Call of Duty 4: Modern Warfare - Activision - 383,000 5. Command & Conquer 3: Tiberium Wars - Electronic Arts - 343,000 6. Sim City 4 Deluxe - Electronic Arts - 284,000 7. The Sims 2 - Electronic Arts - 281,000 8. The Sims 2 Bon Voyage Expansion Pack - Electronic Arts - 271,000 9. Age of Empires III - Microsoft - 259,000 10. The Sims 2 Pets Expansion Pack - Electronic Arts - 236,000