Legion was released on 29 October 2020 for Microsoft Windows, PlayStation 4, Xbox One, and Stadia, and as a launch title in November for the Xbox Series X/S, the PlayStation 5, and Amazon Luna. New content is being added regularly to both the single-player and multiplayer modes, with season pass owners gaining access to exclusive missions and characters.

In March 2021, a cooperative multiplayer mode was added to the game, allowing up to four players to complete missions or explore London together. There are multiple ways to complete missions depending on which playable character is selected. Each playable character has their own unique skills and backgrounds, and can be lost permanently if players enable the option of permadeath before starting a new game. While the core gameplay is similar to its predecessors, consisting of a combination of shooting, driving, stealth, and hacking puzzles, Legion introduces a multiple playable characters system, allowing players to recruit virtually any NPC found in the game's open world. DedSec also attempt to liberate London's citizens from the control of Albion, an oppressive private military company which turned the city into a surveillance state following the bombings. Set within a fictionalised representation of a futuristic, dystopian London, the game's story follows the hacker syndicate DedSec as they seek to clear their names after being framed for a series of terrorist bombings.

It is the third instalment in the Watch Dogs series and the sequel to 2016's Watch Dogs 2. Watch Dogs: Legion (stylised as WATCH DOGS LΞGION) is a 2020 action-adventure game developed by Ubisoft Toronto and published by Ubisoft. Windows, PlayStation 4, Stadia, Xbox One.

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