Kingpin Underworld is a free online multiplayer game with a free offline single-player campaign mode. This game allows you to play as a mafia boss or a gangster, the kingpin of the underworld. You can fight with other mafia bosses or gangsters to control the crime in the city. With the help of your crew and your arsenal of weapons, you can take control of the whole city and establish your own empire. The kingpin of the underworld, you are the one who is going to rule the city.

The game has a story mode, in which you can play as a mafia boss and fight with other mafia bosses.

In the game, you can hire a crew of the toughest thugs from different cities. You can choose to hire a gangster from the city of your choice or a mobster from another city. You can also hire a cartel member or an agent from the government.