During the story, Tommy meets characters from various gangs. As the player completes missions for different gangs, fellow gang members will often defend the player, while rival gang members will recognise the player and subsequently shoot on sight. While free roaming the game world, the player may engage in activities such as a vigilante minigame, a fire fighting activity, and a taxi cab service. Completion of these activities grants the player with context-specific rewards. As Tommy builds his criminal empire, the player may purchase a number of properties distributed across the city, some of which act as additional hideouts where weapons can be collected and vehicles can be stored. There are also a variety of businesses which can be purchased, including a film studio, a taxi company, and several entertainment clubs. Each commercial property has a number of missions attached to it, such as eliminating competition or stealing equipment; once all missions are complete, the property begins to generate an ongoing income available for the player.