Downhill Tricks
Increase speed by 30%:
Hold up anytime during straight sections.
Mogule Jump:
At a jump point, rotate d-button 360 degrees, then jump.
Acro-ski:
Tap down-up-action_button during any straight section.
Speed Skiing Tricks
Speed up:
You could increase the speed even further by bashing the d-button as well.
Forward roll:
During the announcement of your name, tap up-down-left-right-B.
Side roll:
Same as above, except tap the code backwards.
Spherically-Sliced Athlete
You need to have registered a total score of 10000 first. Then while the event is loading, press one of the following sequences to replace your character with the spherically-sliced athlete:
Up,Up,B,Down,Down,B - Yellow Up,Up,Up,B,Down,Down,Down,B - Grey Up,Up,Up,Up,B,Down,Down,Down,Down - Pink