As a genetically-enhanced agent of justice, it's your job to rid the city of crime by any means necessary. You are the extreme solution to an extreme problem as you attempt to take out 21 gang bosses and restore law and order to a sprawling metropolis teeming with lawlessness.
Crackdown is set in Pacific City, a city controlled by three violent gangs: Los Muertos, the Volk and the Shai-Gen Corporation. In Campaign Mode, you have two choices: you can battle gang bosses by yourself, or you can double your effectiveness by enlisting the help of other agents via System Link or Xbox Live. The singular focus in Campaign Mode is on tracking down and eliminating the 21 gang bosses who control the streets of Pacific City. The higher they are in the hierarchy, the better. Be wary, however, that the gang itself will not collapse completely until you wipe out its kingpin, its generals and all of its members.
Each time you locate one of the 21 gang members, you unlock a Time Trial mission that challenges you to take down that particular gang boss. A Time Trial mission is like a steel cage death-match. The gang boss' physical location is transformed into an enclosed arena, and it's up to you to battle your way through the armed guards and protectors to eliminate the gang boss and do it faster than you did before.
There are a number of ways to progress through Crackdown, but all include the acquisition of near-superhuman powers and amounts of offensive equipment with which to lay waste to the scummy gangs. You'll need technology and guile as well as brute force to succeed, and as Crackdown provides some GTA-style freeform chicanery and mayhem for the 360, this adds up to an essential purchase.