Test Drive Unlimited (TDU) is a 2006 open-world arcade-style racing game, featuring over 125 licensed sports cars and motorcycles. The terrain is modeled after the Hawaiian island of Oʻahu that features some 1,000 miles (1,600 km) of roads and highways. Test Drive Unlimited is the ninth main installment of Test Drive, one of the longest running racing game franchises. A sequel, titled Test Drive Unlimited 2, was released on February 8, 2011.