After clearing all sixteen Challenges in a World (the normal run plus all three Challenges of each of the four Levels) go and talk to the King. He will give you a Gold Rank Material for that World which can otherwise only be obtained from the Colosseum. It doesn't matter if the Challenges were cleared in Multiplayer or Solo Mode, as long as all sixteen Triangles are lit up on the Board. You can only receive 1 of each Material from the King.
Unlockable | How to unlock
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1. Supple Leaf | Clear all Challenges in Woodlands.
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2. Thornberry | Clear all Challenges in Riverside.
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3. Divine Whiskers | Clear all Challenges in Volcano.
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4. Beastie Patch | Clear all Challenges in Ice Cavern.
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5. Brittle Papyrus | Clear all Challenges in Fortress.
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6. Golden Insect | Clear all Challenges in The Dunes.
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7. Gold Dust | Clear all Challenges in The Ruins.
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8. Fabled Butterfly | Clear all Challenges in Sky Realm.
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