Assassin's Creed is a non-linear action-adventure video game, during which the player controls a 12th-century Levantine Assassin named Altaïr Ibn-La'Ahad during the Third Crusade, whose life is experienced through the Animus by his 21st century descendant, Desmond Miles. The Director's Cut Edition features four PC-exclusive memories, including the Rooftop Race Challenge, the Archer Stealth Assassination Challenge, Merchant Stand Destruction and Informant Escort Challenge.