New Super Mario Bros. U: Peach's Castle-3 -- Rising Tides of Lava

Lava fills yet another level. The lava rises and falls, which affects the giant Buzzy Beetles. They hide in their shells when the lava reaches their feet and they will float in the lava, making convenient platforms. There is a subtle difference in the color of the land depending on whether the lava reaches it. There are several mushroom platforms with screws that change their height. The first Star Coin is under a ledge with three giant Buzzy Beetles. When the lava is low, wall jump to get it. The next mushroom with a screw will lower so you can continue. There will be a random item block, and farther along, a set of four brick blocks with a Koopa. The second block of the set has a P-Switch, which makes Silver Coins. The path will split ahead. Take the lower path, waiting for the lava to drop, then quickly running and jumping to reach the second Star Coin, which is under the midpoint. Jump over inclines instead of running up them to make it. Ahead are sets of mushrooms that will alternate in their height when the screw is activated. Between two of the mushrooms are a set of two blocks with a gap in the middle. The gap has an invisible block with a vine to the third Star Coin and a Fire Chomp. Go past the Buzzy Beetles in the pit, past another set of mushrooms, and you'll reach the red pipe at the end. There's a Buzzy Beetle below it so you can reach the pipe when the lava rises. This will take you to the flagpole. This opens the path to the Castle.