Microsoft has launched a special promotion on its Games on Demand service. The ‘Best of 2010′ Promotion offers some of the best titles of 2010 at half their price.

Available now via the Games for Windows Marketplace, these are the games included in the Promotion:

50% off

  • Batman: Arkham Asylum Game of the Year Edition
  • Grand Theft Auto IV: Episodes from Liberty City
  • Section 8
  • Age of Empires III: The Complete Collection
  • Zuma’s Revenge
  • Osmos
  • Borderlands
  • Blacklight: Tango Down
  • Bioshock 2

25% off

  • Football Manager 2011

This deal won’t last forever as it ends  1/13/2011 8:30 AM (PST).