Ah, it finally happened. Not content to simply stomp on the sales charts around the world, Call of Duty: Modern Warfare 2 has stomped its authority on the Xbox LIVE Activity chart this week, easily becoming the No. 1 most played online game on the service.

Surprisingly (or not), Call of Duty 4: Modern Warfare sneaks into the No. 2 position, pushing the reigning champion, Halo 3, into No. 3 in one fell swoop. Another Call of Duty game (World at War) and the Left 4 Dead demo follow in quick succession at No. 4 and No. 5 respectively.

As for the top selling Xbox LIVE Arcade titles, this list is still dominated by Trials HD, while Castle Crashers makes a resurgence past SOUTH PARK LET’S GO TOWER DEFENSE PLAY! at No. 3, to take No. 2 once again.

Speaking of ‘once again’… Avatar Drop and I MAED A GAM3 W1TH Z0MB1ES!!!1 find themselves in the list of the top three best selling Xbox LIVE Indie games, as Head Shot 2 (sequel to the ‘inimitable’ Head Shot and prior chart stomper) takes No. 1.

The full global list of top played Xbox Live games, original Xbox games and top selling XBLA and Xbox LIVE Indie Games follows below, all based on unique users and full versions purchased.

Xbox 360 Top LIVE Titles

• Modern Warfare 2
• Call of Duty 4
• Halo 3
• Call of Duty: WaW
• Left 4 Dead 2 – Demo
• GTA IV
• Gears of War 2
• FIFA 10
• Halo 3: ODST
• Madden NFL 10

Top Arcade Titles

• Trials HD
  
• Castle Crashers
  
• SOUTH PARK LET’S GO TOWER DEFENSE PLAY!
  
• Magic: The Gathering
• Battlefield 1943
  
• Hasbro Family Game Night
• Zombie Apocalypse
  
• UNO
• Splosion Man
• Marvel vs. Capcom 2

Original Xbox Top Live Titles

• Halo 2
• Star Wars: Battlfrnt 2
• Counter-Strike
• Fable
• Conker: Live Reloaded
• Splinter Cell Chaos
• Doom 3
• Star Wars: Battlefront
• SW: Republic Commando
• Call of Duty 3

Top Indie Games

• Head Shot 2
• Avatar Drop
• I MAED A GAM3 W1TH Z0MB1ES!!!1
• Avatar Rockets
• Scare Me
• Miner Dig Deep
• Avatar Golf
• Beat Hazard
• Experiment 12
• Lemonade Ltd.