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Hold L and R while you select a one-player game in Grand Prix mode.
Select your class, driver, and track.
Begin your race, and you will be at the bottom of the screen.
At the car select screen hit L(3) a, b, y, b, and finally x. Spider Man can shoot a web by pressing R and L at the same time
If you finish three races in the same place, you'll earn an extra continue.
On the Player Select screen, highlight your driver and simultaneously press Y and A.
The only way to change back during a race is to hit a mushroom dropped by the Princess.
Note: this will not work in Time Trials or Battle Mode.
At the character select screen, press Y.
Hold B just as the Lakitu's first light flashes.
On Controller 1, begin a one-player Time Trial.
When you come to the driver select screen, press Start on Controller 2.
Select a driver with Controller 2, and then select a driver with Controller 1.
Begin the race by pressing Start on Controller 1, and you will be racing against a CPU player.
Enter the Time Trials and select your racer.
Then push Left on your controller to move the cursor beside "Mushroom Cup."
Then press L, R, L, R, L, L, R, R and A.
You should see "Special Cup" appear below "Star Cup."