Grand Theft Auto: Vice City Stories is an action-adventure game for the Sony PS2 and PSP. It is an alternate side game to the Grand Theft Auto: Vice City. It includes completely new missions and a brand new story.

Grand Theft Auto: Vice City Stories is set in a fictional city loosely based on Miami. Players take the role of Victor "Vic" Vance, a soldier whose sergeant gets him involved in drug trafficking. Vance is dishonorably discharged from the military for activities that his sergeant was responsible for. With nowhere else to turn, Vance proceeds deeper into the drug world, doing jobs that eventually bring him back to his old boss in order to enact revenge.Wikipedia: Grand Theft Auto: Vice City Stories

Like other games in the Grand Theft Auto series, Grand Theft Auto: Vice City Stories is a third-person action game, with elements of both shooting and driving thrown in on top. In addition, the game is an open-world adventure, meaning the player can choose to take missions to progress the story, or simply play around in the world, stealing vehicles or doing whatever else they want. Vice City Stories also builds upon the property-owning aspect of Grand Theft Auto: Vice City by requiring the player to purchase and manage properties.Wikipedia: Grand Theft Auto: Vice City Stories