There were four Carnevale challenges and winning them all was rewarded with the golden mask. These challenges were a running race, capture the flag, charming ladies and a fistfight. When Ezio won the first three challenges and seemed to be winning the last one as well, Silvio Barbarigo bribed the Carnevale organizer to allow guards with knives to enter the fight. Ezio then defeated the guards and won the challenge. Barbarigo, however, bribed the organizer to award the mask to Dante Moro instead.
Ezio, Antonio de Magianis and Teodora Contanto planned to take the mask back. Sister Teodora warned them that each mask was numbered to prevent unauthorized access with copies, therefore discounting the possibility of forging a replica. Ezio then suggested killing Dante, but Antonio told him to steal the mask from him instead using the courtesans to distract him, as killing Dante would surely cancel the party altogether.
After successfully stealing the mask, Ezio wore it to enter Marco Barbarigo's party. There, Ezio hid from the Templar guards and Dante, while they searched for Ezio and the stolen mask. Under the cover of the fireworks, Ezio then assassinated Marco with his hidden gun.
Behind the scenes
The mask is the type known as Bauta because it is a full mask that obscures the entire face.
Although Sister Teodora cautioned Ezio that each mask was numbered, the guards at the entrance to the Doge's party do not make any effort verify its authenticity, nor is any number visible on the mask.
The golden mask does not affect notoriety.