Master code:
At the main menu, quickly press Up, Down, Up, Down, Up, Down, Up, Down, Up, Down, Left, Right, Left, Right, Left, Right, Left, Right, Left, Right. This will unlock everything.

All boarders:
At the main menu, rotate the Right Analog-stick clockwise about fifteen times.

Extra boards:
At the main menu, quickly press Up, Up, Left, Left, Right, Right, Down, Down, Up, Left, Right, Down, Up, Left, Right, Down.

Level select:
At the main menu, quickly press X, X, X, X, B, B, B, B, Y, Y, Y, Y, X, B, Y.

Unlock Jordan:
Collect every star in the Star Search challenges.

Thanks to Revolution readers Jake Mohr, Bobby Watson and Livalittle!