NOTE #1:
One of the normal boards turns into a rainbow-colored or a black one (rainbow effect takes place in the game).
xx=5d;50;53;00;a5;aa

NOTE #2:
Collect a boost. This boost will never vanish, even if you crash.

NOTE #3:
Box-picture looks different to the item you really get.

NOTE #4:
This code causes Player 2 to float like the hoverboards in "Back to the Future II". However, he can jump infinitively often by pressing A.