Press Up, Down, Left, Right at the title screen. A number that corresponds to the starting level will appear on the top right corner to confirm correct code entry. Press Up or Down to select a level.
Super jump
To do a super jump, you need to drive 200 kph and press Down, Up at the top of the jump. Then 1 while in the air and 2 before your bike lands on the ground.
Track Select
On the title screen, Press RESET, then UP, DOWN, LEFT, RIGHT.