Assassin's Creed Revelations is the official fourth installment in the Assassin's Creed franchise, developed and published by Ubisoft. Throughout the course of the game, the three protagonists from the previous games are featured: Altair, Ezio and Desmond. The game was released for PlayStation 3 and Xbox 360 on November 15, 2011 and for Microsoft Windows on November 29, 2011. A trailer was released at E3 2011, displaying Ezio in his older years, along with a video demo of the game play.



Desmond has been left comatose at the end of Assassin's Creed: Brotherhood and has been placed into the Animus, in a new area called the Black Room (the opposite to the White Room seen previously). Desmond has to piece together Ezio's later memories in order to reform his mind and escape the Animus. This requires him to undergo platforming puzzles in the Animus while trapped in a failsafe mode of sorts called Animus Island, where he is able to converse with the digitally simulated personality of Subject 16, who informs him that only by finishing what he started and completing Ezio and Altair's stories can the Animus separate the three and rescue Desmond's fragile mind. Meanwhile, Ezio, now much older, continues his search to find out more about the origins of the Assassin Order and connections to Altair's past. Primarily, Ezio is after the 5 keys needed to unlock Altair's library under the ruins of the Assassin castle at Masyaf, which he believes contains the knowledge he is seeking. However, the Templars also wish to get into the library, seeking a weapon of great power said to be hidden there.



These keys also allow Ezio to access Altair's memories much in the same way as the Animus allows Desmond to access Ezio's memories. This search leads Ezio to make his way to Ottoman-era Istanbul, where the Assassin Guild there, led by Master Assassin Yusuf Tazim, takes him in as a legendary Mentor. After mistakenly killing a man sent to stop the Templars, Ezio travels to Cappodocia to free his men and kill the man responsible for arming the Templars. Once the final key is retrieved, Ezio travels to Masyaf and discovers not a library, but a vault with Altair's remains and another key showing the location of the weapon, revealed to be an Apple of Eden, which Ezio leaves, stating that he has "seen enough for one lifetime." He then speaks with Desmond through the void, leaving his hidden blades and sword behind. Ezio's story is concluded in the short film Assassin's Creed: Embers, where he journeys to Firenze with his wife Sofia and their daughter Flavia, despite suffering from heart problems. While resting on a bench and after having a short conversation with a young man with a scar on his face, similar to the sort of man he used to be, he exhales and dies in view of his family.



The game includes many new systems, including additional weapons. Bomb-crafting is now available, allowing the player to create explosive, distraction and tactical bombs, using materials found throughout the world and on Assassin's Guild missions. As the player progresses through, Ezio can train new recruits to defend "dens" (Assassin HQs) and an upgraded Assassin's missions section called "Mediterranean Defense" in which the player works to strip control of various cities from Templar hands. The hookblade is also introduced, which can be used in free-running (to travel along zip wires and climb more easily) and in combat (to manipulate enemies). Eagle Vision has been upgraded to Eagle Sense, which allows Ezio to not only see where his enemies and targets are but where they have been and where they are going to be. The multiplayer mode returns in Revelations, this time with more characters, modes, and maps. Multiplayer will now tell you the origin of Abstergo as you level up. The Lost Archive DLC is played from the viewpoint of Subject 16, Clay Kaczmarek. You find out how he was brought into the Assassin Order, and how his relationship with his parents was strained. Also, the real story behind Lucy Stillman who turns out to be a triple agent: a templar posing as an assassin posing as a templar.



Clay is then left to die in Abstergo as he slowly goes insane from overuse of the Animus, this leads to him slitting his wrists and painting the pictures, in his own blood, that Desmond is able to see at the end of Assassin's Creed and at the start of Assassin's Creed II. An encyclopedia on the Assassin's Creed universe has been created to accompany the Animus edition of the game. This book contains a plethora of information on everything in the Assassin's Creed universe and contains much artwork, many designers even put in designs for assassins in other time periods and cultures.