There are six hidden challenges in total. You must find and clear the first five to unlock the final, secret map:
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Standard Jump – Hidden in the “Unused” map; enter through a secret door.
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Bubble Blast – Found in the “Races” section, inside the “Blizzard Eruption” map.
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Propeller Pipework – The challenge in the “Scrupulous Mansion” map.
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Grapple Gym – Located within the “Sky Ward” map.
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Sci-Float – Hidden in the “VB Land” map.