According to Microsoft, Grand Theft Auto IV was the most played game on Xbox Live last week, beating out Call of Duty IV and Halo 3 for the honor.

This is pretty amazing given that the GTA series has never been known for its online play. Click the cut for the full list of top LIVE titles as well as the Arcade best-sellers of the week and the top Xbox original titles.

Xbox 360 Top Live Titles
1 GTA IV
2 Call of Duty 4
3 Halo 3
4 Guitar Hero III
5 Gears of War
6 Rock Band
7 Tom Clancy's Rainbow Six Vegas 2
8 GRID Demo
9 FIFA 08
10 Bourne Conspiracy Demo

Top Arcade Titles (Full Versions)
1 Wits & Wagers
2 UNO
3 DOOM
4 Brain Challenge
5 Ikaruga
6 N+
7 Bomberman LIVE
8 Worms
9 Assault Heroes
10 Sonic The Hedgehog 2


Original Xbox Top Live Titles (based on UU’s)
1 Halo 2
2 Star Wars: Battlfrnt 2
3 Counter-Strike
4 Battlefield 2: MC
5 Fable
6 Splinter Cell Chaos
7 Call of Duty 3
8 Street Fighter Anniv.
9 Doom 3
10 Conker: Live Reloaded