Tek-9 glider
Finish the game with any character to unlock the Tek-9 glider.
Hex
Finish the game with Chops, Sid, and Zero-G to unlock Hex as a selectable character.
All characters
Pause the game, then hold down L and press X, B, Left, Y, Right(2) to unlock all characters.
50 balls
Pause the game, then hold down L and press Up, X, B, Y, Left(2).
Never get hit by items
Pause the game, then hold down L and press X, B, B, Left(2), Y, B.
Have fruits during entire race
Pause the game, then hold down R and press B, X, Left(2), Y.
Flying abilities for any character
Pause the game, then hold down L and press X, Y, A, Left(2), Right(2).
Unlock Tremmel King, Roscoe, Hex, Gex, Tek-9, and Sydner
To unlock Tremmel King get all 3 shortcut medals in all of the 8 levels. To unlock Roscoe get 20 Hex Bux in all 8 levels. To unlock Tek - 9 beat the game with any character. To unlock Sydner beat all the levels in the time challenge. To unlock Hex you must beat the game with all 3 original characters (Chops, Zero - G, and Sid). To unlock Gex you must get all the status decals.
Easy Win on Alpine Cup
You know how your always in last? Well, if you are in last here's what you do, right about at the end of the race, when you'r in the ice area, you should see a slope with ice covering most of it, climb it. (Note that you have to be a tribrid or a real glider) once your about to jump of the edge, jump right and glide to the right. You should reach the finish line before the computers do!