Sega GT Online was released in 2003 and 2004 by Wow Entertainment for the Xbox. It was the sequel to Sega GT 2002. The game is essentially the same as its predecessor, but adds new cars, tracks, weather and an online mode.
The player must control their car, and drive to the finish line, across many tracks. In the main mode, the player is given a set amount of money to buy a car, and must progress to become an Official Race Champion. In Chronicle Mode, the player starts with a car from the 1960's, and must progress through the years against newer cars. There is also a Quick Match Mode, a Time Attack Mode and a Replay Studio.