Which Assassin's Creed game is set primarily in ninth-century Baghdad and follows Basim?

Assassin's Creed Mirage is set primarily in ninth-century Baghdad and follows Basim.

Released in 2023, Mirage tells the earlier story of Basim Ibn Ishaq, a character first introduced in Assassin's Creed Valhalla. The game follows his rise from a street thief in Anbar to a Hidden One in Baghdad. Its setting is the Islamic Golden Age, with the city divided into districts connected by investigation, parkour, stealth, and assassination missions.

Mirage was designed as a more focused, compact experience than several recent open-world entries. It returns to the traditional Hidden Ones terminology and emphasizes social stealth and targeted investigations. Although Basim is associated with Valhalla, Mirage is his origin story and is not simply an expansion of that game.