Level | How to unlock
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Desert Ruins Zone Extra Level | Collect all 15 red star rings in Desert Ruins.
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Frozen Factory Zone Extra Level | Collect all 15 red star rings in Frozen Factory.
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Lava Mountain Zone Extra Level | Collect all 120 red star rings in the game.
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Silent Forest Zone Extra Level | Collect all 15 red star rings in Silent Forest.
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Sky Road Zone Extra Level | Collect all 15 red star rings in Sky Road.
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Tropical Coast Zone Extra Level | Collect all 15 red star rings in Tropical Zone.
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Windy Hill Zone Extra Level | Collect all 15 red star rings in Windy Hill.
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