In GP mode,
if you get the gold in all the 100cc cups, you will be awarded with the
special cup.
In GP mode,
if you get gold in all three cups in the 50cc, and if you get the gold
in all FOUR cups in the 100cc cup, you will be awarded with the 150cc.
In GP mode,
and match race, if you press "A" and "Y" at the same time once the 1 or
2 player symbol is above your driver, but before you choose your driver,
the picture of your driver will shrink and you will ride the whole cup
or the race as an itty bitty dude, unless you run into one of princess's
or toad's mushrooms that they hurl at you.
In time trial
mode, if you press start on 2 player's controller, your can choose a driver
for the computer and race that driver's "ghost" in the time trial races.
At The beginning
of every race, you can get a speed burst that is equal to a mushroom. The
trick is to start holding the "B" Button at just the right time. You need
to press and hold the "B" Button a fraction of a second after the first
light comes on, or you can start holding it down just as the "Round 1"
or "Round 2" ect. signs start to disappear. It takes some pratice, but
you'll get it eventually.