From the Super Mario Wiki
Sunglow Ridge is a location from Paper Mario: Color Splash. The path leading here is unlocked after getting the yellow Mini Paint Star in either Daffodil Peak or Bloo Bay Beach, and unlocks a path leading to Château Chanterelle. When Mario first arrives here, he is unable to explore it due to the Scarlet Gate being drained of its color, though he does find a purple Rescue Squad member here. After the Red Big Paint Star is obtained from The Crimson Tower, it colors in the Scarlet Gate, allowing the area to be explored.
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