All Tracks
1.Set the game to MASTER difficulty and 5 laps per race.
2.Press X on Li'l Dave then return to the title screen.
3.Press Up, Down, Left, Right, R2, R1, L2, L1 within four seconds.
4.Set the game to 3 laps per race.
5.Press X on Wild Ride, then return to the title screen.
6.Press Up, Left, Down, Right, Square, R2, Circle, L2 within four seconds. You should hear a tone.
7.Now set the game to AMATEUR dificulty with turbos off.
8.Press X on Bomber and return to the title screen yet again.
9.Press Up, Down, Left, Right, Up, Down, Left, Right within four seconds.
10.Set to PROFESSIONAL difficulty and turn turbos on again.
11.Finally, press R2, R1, L1, L2, R2, R1, L1, L2.
Bonus Character And Tracks
Fast Aerial
Hold L2 and L1 and down left
OR
Hold R2 and R1 and down left.