Watch Dogs is an action-adventure game, played from a third-person view. The player controls hacker Aiden Pearce, who uses his smartphone to control trains and traffic lights, infiltrate security systems, jam cellphones, access pedestrians' private information, and empty their bank accounts. System hacking involves the solving of puzzles. The game is set in a fictionalized version of Chicago ("Windy City"), an open world environment which permits free-roaming. It has a day-night cycle and dynamic weather system, which changes the behavior of non-player characters (NPCs). For melee combat, Pearce has an extensible truncheon; other combat uses handguns, shotguns, sniper rifles, machine guns, and grenade launchers. There is a slow motion option for gunplay, and the player can use proximity IEDs, grenades, and electronic lures. Lethal and non-lethal mission approaches can be enacted.