Unlock Frightmare:
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To unlock Frightmare, beat Bowser’s Nightmare in Story Mode.
Unlock Hard Difficulty:
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To unlock the Hard difficulty setting for an indiviudal game type,
beat the game on Normal.
Unlock Bowser’s Nightmare:
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To unlock Bowser’s Nightmare, beat the Story Mode.
Unlock Intense Mode:
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To unlock Intense Mode, beat the Story Mode on Normal.
Best Car in Super Duel Mode:
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Buy all of the E. Gadd car parts for a perfect car.
(Body, Cannon, Engine, Jet).