To use these codes you must be fast enough to have your time entered on the high score screen (make sure to turn checkpoints on from OPTION screen.)
|knacked - Reverse tracks|
|whoooosh - Nitros (press HORN while racing)|
|mjcim.rc - Tiny cars|
|sausage - Bonus cars|
Note: After entering the codes make sure you save your game. Otherwise, you will have to run this each time you play. Also, if you use the Nitro code don't try it until you're in second or higher gear. Otherwise you'll spin out.