"YEAH!"
Put
in the following code at the "start" screen (where you can
select start, lesson, or option), to start with all the extra tracks,
boards etc.
Joy
Stick Down, Joy Stick Up, D-pad Down, D-pad Up, C-Down, C-Up, L, R, Z,
D-pad Left, C-right, Joy Stick Up, B, D-pad Right, C-Left, and last
press Start.
If
you did it right you'll hear a kid saying "Yeah!"