All cars and tracks:
Enter Down, Left, Up, A, Down, Right as a password to unlock all levels and cars, including the Twin Mills.

Level	Password
Shadow Jet
2	Left, Up, Left, Down, Up, A
3	Right, Up, Right, Down, Up, A
4	Up, B, Up, Up, Left, A
5	B, Left, B, Up, Up, Left
6	Down, Left, Up, A, Up, Up
End	Down, Left, Up, A, Down, Right
Tow Jam
2	B, B, Left, Up, A, B
3	Left, Left, Up, A, Right, Right
4	Left, Left, Up, Left, A, Left
5	Down, Up, Left, Down, Down, A
6	B, B, B, Right, Right, Up
End	Down, Left, Up, A, Down, Right
Way To Fast
2	Right, A, Right, B, Left, Down
3	Down, Right, B, Right, Down, B
4	Right, Right, Down, A, Down, A
5	Up, A, A, Down, Left, Up
6	Left, Up, A, B, B, Right
End	Down, Left, Up, A, Down, Right
Slide Out
2	Down, A, Up, A, B, B,
3	Left, B, Left, Right, Down, B,
4	Down, B, B, B, Right, Down,
5	A, A, Right, Right, B, Down,
6	Right, Up, Left, Up, Left, Right,
End	Down, Left, Up, A, Down, Right,
Twin Mill
2	Down, Left, B, B, Right, B,
3	Up, B, Down, Down, Right, Left,
4	Right, Up, Right, B, B, Right,
5	Right, Up, Right, Down, A, Right,
6	Right, Left, Up, A, Up, Down,
End	Down, Left, Up, A, Down, Right,