All upgrades are free.
Take the Sportsbike challenge, race your sports bike through the city, desert, outback, mountains and salt lake. Race against 8 other competitors each raceand use your turbo to overtake and win the race. Upgrade your bikes engine, handling and turbo in order to progress.
Use the cursors to steer and up and down to accelerate/reverse, or WASD. X or N to turbo.