ALWAYS HAVE JET-PACK
Press L + R + C-UP + C-DOWN + C-LEFT + C-RIGHT at the main menu
then start the level and you will be able to fly.
FUNNY NOISES
When racing, press any direction on the D-pad and you will hear
a horn, a burp, a fart and other funny noises.
HIDDEN TEMPLE
Select the course "Ruins". Then find the jetpack. After you find
the jetpack fly over to the road that makes a small circle in the
the left side of the map. There you will find a temple. You can use
the jetpack to fly in the top OR go to the back of the temple where
there is a small entrance.
AZTEC VALLEY TRACK
Successfully complete a circuit under the easy difficulty setting.
DEATH TRAP TRACK
Successfully complete a circuit under the hard difficulty setting.
ALPINE CHALLENGE TRACK
Successfully complete a circuit under the medium difficulty setting.