Grand Theft Auto: San Andreas is played from a third-person perspective in an open world environment, allowing the player to interact with the game world at their leisure. The game is set within the fictional US state of San Andreas, which is heavily based on California and Nevada. The state of San Andreas consists of three metropolitan cities: Los Santos, based on Los Angeles; San Fierro, based on San Francisco; and Las Venturas, based on Las Vegas. The single-player story follows Carl "CJ" Johnson, who returns home to Los Santos from Liberty City after his mother's murder. Carl finds his old friends and family in disarray, and over the course of the game he attempts to re-establish his old gang, clashes with corrupt cops, and gradually unravels the truth behind his mother's murder. The plot is based on multiple real-life events in Los Angeles, including the rivalry between the Bloods, Crips, and Hispanic street gangs, the 1980s crack epidemic, the LAPD Rampart scandal, and the 1992 Los Angeles riots.