The action in Test Drive Unlimited takes place on the open roads spanning the Hawaiian island of Oahu. In solo mode, players complete challenges and pit their wits against realistic AI opponents to gain points, unlock further tests of their skill and open up more of Oahu's diverse tropical road system. With the massive online component, which allows racers across the globe to challenge others in the virtual paradise of the game's persistent online racing world, Test Drive Unlimited offers one of the most comprehensive video game racing experiences to date.