Watch Dogs (stylized as WATCH_DOGS) is an open world action-adventure video game developed by Ubisoft Montreal and published by Ubisoft. It was released worldwide on 27 May 2014 for Microsoft Windows, PlayStation 3, PlayStation 4, Xbox 360 and Xbox One, with a Wii U version planned for release on 18 November 2014 in North America and 21 November in Europe. Set within a fictionalized version of Chicago, Illinois, the single-player story follows a hacker and his efforts to seek revenge after the accidental death of his niece. The open world design lets players freely roam Chicago, which includes the urban city, open countryside, and slums. The game is played from a third-person perspective and its world is navigated on-foot or by vehicle. Players control Aiden Pearce, a highly skilled grey hat hacker who can hack into the "ctOS", a centralized operating system which manages the hyper-connected city of Chicago, and formed after a Northeast blackout of 2003 was caused by a hacker. Players can choose to play as criminals or vigilantes. An online multiplayer mode is also provided in the game, allowing up to eight players to engage in both cooperative and competitive gameplay in a recreation of the single-player setting.