New Super Mario Bros. U: Soda Jungle- Castle -- Iggy's Volcanic Castle

In this castle are continuous waves of lava. We get the Ice Flower so we can freeze enemies, but the lava will thaw them out if it touches them. Some parts of the floor move vertically, so be careful. The first Star Coin is under a ledge near the lava. Freeze a Dry Bones, and, with good timing, slide it into the coin, making sure the Dry Bones doesn't hit the lava before it hits the Star Coin. After the midpoint is a Red Coin Ring. Overhead is a pipe. Bounce off of the Dry Bones or freeze it to reach it, then use the POW Block inside to make the second Star Coin and some coins drop down. Go through the yellow pipe. Go past some Podoboos and you'll find a green pipe in the lava just before the boss door. The third Star Coin is over a giant Dry Bones in the lava. Bounce off it to get the Star Coin. Once through the boss door, take the cannon to Iggy's Airship. His Airship has lava below the floor. Iggy goes through the pipes in the room, then throws three fireballs: two green ones, one red one. The red one becomes a Blaarg once it hits the lava. Dodge the Blaarg and Iggy will drop down so you can hit him. His shell cycle is longer than the other Koopalings so far because he goes through the lower pipes. Hit him before he can start moving around to finish him quickly. Once he's defeated, the path to the Rock-Candy Mines opens up.