Most likely because of the one day sale for this game earlier last week that cut its price to just $10.20, Valve's zombie shooter sequel Left 4 Dead 2 has been boosted up to the top of the weekly top 10 best selling games on the Steam PC game download service. The THQ Complete Pack with 20 games for just $49.99 is at the number two slot this week followed by the newly patched and Mac-ified Counter-Strike Source at number three. The full list is below:

1. Left 4 Dead 2 - Valve
2. THQ Complete Pack - THQ
3. Counter-Strike Source - Valve
4. Call of Duty Pack - Activision
5. Bioshock 2 - 2K Marin/2K Games
6. All Points Bulletin - Realtime Worlds/EA
7. Resident Evil 5 - Capcom
8. Dragon Age Origins Deluxe Edition and Awakening - BioWare/EA
9. Sniper: Ghost Warrior - City Interactive
10. Transformers: War for Cybertron - High Moon Studios/Activision