Reversed tracks: Complete championship mode under the "Novice" and "Expert" difficulty levels.
Hidden cars: Complete one of the following series with the corresponding setting to enable a bonus car.
Porsche 959
Arcade Basic series (Novice)

Ferrari 512 TR
Arcade Pro series (Novice)

Bugatti EB110 GT
Normal Championship series (Novice)

Ferrari F-50
Arcade Basic series (Expert)

Dodge Viper GTS
Arcade Pro series (Expert)

McLaren F1
Normal Championship series (Expert)
Hint: Short cut: On the race with the castle and dirt road to the side, there will be two rock formations that your car drives under. Immediately after driving under the second formation, make a hard left turn. If done correctly, your car will pass through the wall and reach the short cut.