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Yes, it's exactly as it sounds...

Crackdown; one of the most fun and pointless games I've played on the 360 to date.

Take GTA4, pump a shit-load of steroids into your character, add a rediculous amount of carnage, then add the ability to play the entire game Co-op, Live.

I cannot believe that I missed this game when it came out; apparently it was one of the first few games released onto the 360!

Official Crackdown site

From Wiki:

"Crackdown was conceived by Realtime Worlds' founder, David Jones, who also created Grand Theft Auto and Lemmings.

Set in the fictional Pacific City, the player controls a cybernetically-enhanced Agent, tasked with defeating three crime lords and their organized crime syndicates. The Agent's abilities improve by defeating both crime lords and their supporters, as well as by completing optional activities, such as street races and scavenger hunts. The gameplay is nonlinear: instead of following a rigid mission sequence, players are free to select the approach to completing their missions and activities.

Crackdown, initially planned for release on the original Xbox console, was envisioned as a vast world in which players could experiment and explore freely. Even though this concept was implemented for the Xbox 360 version, playtesters were largely critical of the game, leading Microsoft Game Studios to fear that it would not be well received. To boost sales, Microsoft Game Studios bundled Crackdown with an access code to the multiplayer test version of the much-anticipated Halo 3. At least partially as a result, the game sold 1.5 million copies in its first six months of release. Despite initial concerns, Crackdown received positive reviews and has garnered several awards for its innovative gameplay."

I would seriously recommend everyone tries this game, highly addictive and equally pointless but fun!