Mafioso is a cancelled strategy / simulation game for the original Xbox, in which the player was going to be an italian gangster, on his way to became the boss of the city. The project was created by Teleplan Development Studio, but probably they never found a publisher interested in the game. Teleplan was closed and Mafioso was never released. As we can read from the official press release:
Mafioso features advanced AI, incredibly detailed characters and vehicles, a complex reputation and diplomatic system, a feature-rich economical structure with legal businesses, money laundering operations and illicit activities, all set up in a huge 3D urban environment.