Gameplay
Crackdown is a Third-person shooter set in a sandbox environment, akin to Mercenaries: Playground of Destruction. After selecting one of the predefined Agent characters, the player is assigned to defeat the Kingpin of each gang, though there is no precise approach to do this, leaving players to select their preferred method. While the player may face the Kingpin and his bodyguards at any time, they can improve their chances of taking out the Kingpin by facing and defeating the various Generals responsible for certain aspects of the Kingpin's offense and defense, removing them from play. For example, by eliminating a gang's weapon dealer, gang members will no longer be as heavily armed or will fire fewer shots to conserve ammunition; assassinating the gang recruitment officer similarly reduces the size of the Kingpin's protective force. It is at the player's discretion whether to kill the Generals or skip them entirely before facing the Kingpin. However, the gangs cannot be completely eradicated from the city without tracking down and killing all Generals and Kingpins.
Much like other sandbox games, the player uses melee attacks, guns, and explosives to fight the opposing forces, and can run, climb buildings, jump across rooftops, or use vehicles to navigate the city. Crackdown features a series of character-based skills that can be upgraded to increase specific traits that can be used in combat, driving, or on-foot agility. These skills include: "Agility", which increases the Agent's ability to jump, run, and swim; "Driving", affecting how well he can handle a vehicle; "Explosives", which affects the power and range of explosive weapons; "Strength" that increases the Agent's strength, namely by increasing his ability to lift and throw, as well as how hard he can strike an opponent; and "Firearms", which improves the character's aptitude with weapons. Crackdown's skills make few concessions to realism: character abilities are similar to those of comic book superheroes or cartoon characters. This concept is further highlighted by the ink-like outlines drawn around in-game characters.
Skills are usually improved by gaining experience orbs, which are released from defeated enemies. The type of orb released varies, depending on how the player dispatched the foe; for instance, killing an enemy with a gun will earn Firearms orbs, while running them over with a vehicle earns Driving orbs. More powerful enemies release more experience orbs. However, Agility orbs are awarded differently: they can be earned by either climbing buildings and seeking them on rooftops, or by killing an enemy from a high altitude. The player can also compete in "rooftop races"—a race through a series of waypoints across the rooftops of Pacific City—or car races to gain Agility and Driving orbs, respectively. A few special orbs, well-hidden, increase all character abilities when found. A final way to collect orbs is by earning Xbox Live Achievements, which rewards the player with orbs from every skill category. Each skill has five levels—beginning with zero stars, and ending with four—with a numeric gauge on the display to indicate how close the player is to the next level. Should the character die, or injure civilians or Agency peacekeepers, their experience gain will be slowed, making it temporarily harder to improve the character's traits.
The entirety of Pacific City may be explored from the start of the game, allowing the player to locate the hideouts of each General and Kingpin, which can be made easier by accessing supply points scattered around the city. Once a supply point is unlocked, the player has the option of returning there to travel to any other supply point, restock on weapons and ammunition, or drop off newly acquired weapons, to permanently add them to their weapon selection. Should the player die, they can respawn at any open supply point. While exploring, the player is likely to come across enemy resistance, with their aggressiveness based on how badly the player has damaged that particular gang recently. If the player is too aggressive against the non-gang residents of Pacific City, including the Peacekeepers, they are flagged as rogue, and Agency hit squads are dispatched to take them down.
Crackdown features an online two-player cooperative play mode that allows drop-in play. Both players may explore the city freely, with the other player's position noted on the HUD map. Players can fight alongside each other, and also inflict friendly-fire damage. The state of the city, including which Generals and Kingpins remain, is determined by the host player's progress. Both players are credited with the defeat of a General or Kingpin in the game—which will affect the state of the guest's progress—but are required to obtain supply points and gain experience independently. Co-op players can race against each other in both rooftop and road races, should they both choose to participate.
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