Secret Track
     Choose  "Wreckin' Racing", then "Championship" and enter the name
"REFLECT!". Now go to the main menu again and choose "Wreckin' Racing"
again.  This  time,  choose "Practice". At the track selection screen,
you should see the new track.

Invincibility
     Follow the steps above, but enter "!DAMAGE!" as your name instead.

Select Number of Racers
     Follow   the  steps  for  'Secret  Track',  but  enter  the  name
"NPLAYERS" instead.