Captain Toad is searching for Toadette. He fell asleep in a cave. There's a nearby hidden plant with many coins. Climb the ladder and walk to the Star. Feathers appear and Wingo takes the Star, with Toadette.
This level has many rolling areas over lava as well as Blaargs that periodically jump out of the lava. Cross over the green roll to a grate, then over a thin green roll to an area with some coins. Use the large green roll to drop down to a fan. Walk under another large green roll to the first gem. Use the fan to reach a higher level. Go across the three green rolls to reach the second gem. From the middle green row of the set, drop down onto the fan and use it to reach a lower platform with the third gem. It's towards the back, past a grate that a Blaarg goes through. Use the fan to reach the grate near the Star, then get the Star.
Special Challenge: Collect 75 coins.