Grand Theft Auto IV is a 2008 action-adventure game developed by Rockstar North and published by Rockstar Games. It is the sixth main entry in the Grand Theft Auto series, following 2004's Grand Theft Auto: San Andreas, and the eleventh instalment overall. Set within the fictional Liberty City, based on New York City, the single-player story follows Eastern European war veteran Niko Bellic and his attempts to escape his past while under pressure from high-profile criminals. The open world design lets players freely roam Liberty City, consisting of three main islands, and the neighbouring state of Alderney, which is based on New Jersey.