Assassin's Creed: Revelations is a 2011 action-adventure video game developed by Ubisoft Montreal and published by Ubisoft. It is the fourth major installment in the Assassin's Creed series, a direct sequel to 2010's Assassin's Creed: Brotherhood. The game was released on PlayStation 3, Xbox 360, and Microsoft Windows in November and December 2011.
The plot is set in a fictional history of real-world events and follows the centuries-old struggle between the Assassins, who fight for peace with free will, and the Templars, who desire peace through control. The framing story is set in the 21st century and features the series protagonist Desmond Miles who, with the aid of a machine known as the Animus, relives the memories of his ancestors to find a way to avert the 2012 apocalypse. Revelations features two other returning protagonists: Altaïr Ibn-La'Ahad in 12th and 13th century Masyaf, and Ezio Auditore da Firenze in 16th century Constantinople. The main story follows the Assassin Ezio's journey to unlock the secret of Altaïr's vault in Masyaf using disc-like artifacts containing Altaïr's memories.
Assassin's Creed: Revelations is set in an open world and presented from the third-person perspective with a primary focus on using Ezio's, Desmond's, and Altaïr's combat and stealth abilities to eliminate targets and explore the environment. One of the protagonists (Ezio) is free to explore the Assassin Base in the city of Constantinople and the city itself to complete side missions away from the primary storyline.
Critical response towards the game was generally positive, with praise directed at the detailed environments, well-written protagonists, pacing and satisfying ending of the plot, although some reviewers noted that the gameplay of the series was getting overly familiar and the newly introduced features felt lacking in comparison to the ones introduced in previous titles of the series. The game was a large commercial success, outperforming the sales of its predecessors. The game was followed by Assassin's Creed III in October 2012, a direct sequel that continued the story of Desmond Miles and introduced a new 18th-century playable character and set in the New World.
A remastered version, along with its predecessors Assassin's Creed II and Assassin's Creed: Brotherhood, released for the PlayStation 4 and Xbox One on November 15, 2016 as part of The Ezio Collection.