Mafia Definitive Edition can be played offline.

The first option is to give the steam account password and usernames. Require Team Viewer to share the game to your account, can play lifetime, can play offline only, one device one order, option 2: can play offline only, one device one order, option 2: can play offline only, one device one order, option 2: can share the game to your Just like you own the game, you can play online, save file, and etc.