After some apparent number-crunching over at Major Nelson’s blog, The Major has come up with a list of the most played and most bought games on Xbox LIVE.

The chart toppers are hardly surprising, with Halo 3 being the most played Xbox LIVE game, Castle Crashers represents the best selling game on Xbox LIVE Arcade while Halo 2 takes the number one spot for most played original Xbox game.

The full lists follow below, based on unique users and original games purchased:

Top Xbox 360 LIVE Titles:

• Halo 3
• Call of Duty 4
• GTA IV
• Gears of War 2
• Gears of War
• CoD: World at War
• Guitar Hero III
• Battlefield: Bad Company Demo
• Star Wars: The Force Unleashed Demo
• Rock Band
• Fable II
• Mirror’s Edge Demo
• Madden NFL 09
• BF: Bad Company
• Rainbow Six Vegas 2
• UNO
• Castle Crashers
• COD: World at War Multiplayer Beta
• Forza Motorsport 2
• Too Human - Demo

Best Selling Xbox LIVE Arcade Titles:

• Castle Crashers
• Geometry Wars: Retro Evolved 2
• Braid
• A Kingdom for Keflings
• UNO
• Super Street Fighter II Turbo HD Remix
• Fable II Pub Games
• Duke Nukem 3D
• Bionic Commando: Rearmed
• Worms
• SOULCALIBUR
• Portal: Still Alive
• DOOM
• 1942: Joint Strike
• Bomberman Live
• MEGA MAN 9
• N+
• Wolf of the Battlefield: Commando 3
• Marble Blast Ultra
• Ultimate Mortal Kombat 3

Top Original Xbox LIVE titles:

• Halo 2
• Fable
• Star Wars: Battlfrnt 2
• Counter-Strike
• Fable: Lost Chapters
• Doom 3
• Conker: Live Reloaded
• Splinter Cell Chaos
• SW: KOTOR
• SW: Republic Commando
• Star Wars: Battlefront
• Burnout 3
• Guilty Gear XX #Reload
• Gauntlet Seven Sorrows
• Call of Duty 3
• Ninja Gaiden Black
• Crimson Skies
• MechAssault 2
• Call of Duty 2
• Rainbow Six 3