1. Call of Duty: Black Ops (Activision) - $98.2 Million USD 2. Call of Duty: Modern Warfare 2 (Activision) - $39.4 Million USD 3. Left 4 Dead 2 (Valve) - $36.0 Million USD 4. Battlefield: Bad Company 2 (Electronic Arts) - $25.4 Million USD 5. Sid Meier’s Civilization V (2K Games) - $21.9 Million USD 6. Portal (Valve) - $20.0 Million USD 7. Fallout: New Vegas (Bethesda Softworks) - $17.0 Million USD 8. Metro 2033 (THQ) - $13.4 Million USD 9. Mafia II (2K Games) - $11.9 Million USD 10. Warhammer 40,000: Dawn of War II: Chaos Rising (THQ) - $10.8 Million USD