Set the difficulty to Master and laps to 5. Go to 1 player mode and choose Li'l Dave. Go back to the main menu and press Up, Down, Left, Right, R2, R1, L2, L1. Now go and set the laps to 3 then go back and select Wild Ride, then exit back out to the main menu and press Up, Left, Down, Right, Square, R2, O, L2. All the button sequences must be pressed within 4 seconds. Now you can play all the tracks from Jet Moto 1, just go to the track select and press O on any track to change it to the Jet Moto classic version.
Set the difficulty to amateur, the laps to 3, and turbo off. Go to the one player select screen and choose Bomber. Now exit to the title screen and press Up, Down, Left, Right, Up, Down, Left, Right. Now set difficulty to Professional and turbo on. Go back to the title screen and press R2, R1, L1, L2, R2, R1, L1, L2. All button sequences must be done within 4 seconds.