New Super Mario Bros. U: Rock-Candy Mines-5 -- Walking Piranha Plants

Before you start the level, you can get Blue Baby Yoshi. Some of the rocks in the level will tilt when you stand on them, and eventually fall off. There are chains in the level to swing from. The walking Piranha Plants will move around, then stop and stretch their necks. In the area with three Piranha Plants and a Koopa, use the shell on the lower right rock to get access to the first Star Coin. There is a large gap in the ceiling next to a Piranha Plant and a chain near the area with platforms. Use the Acorn Mushroom to fly up into the gap to a new area. Hit the P-Switch, stand on the brick blocks, and fly to the left, then boost for the second Star Coin. Past the random item block and midpoint is a Red Coin Ring. There are moving platforms ahead with Walking Piranhas on them. The red pipe in the ground will give you some coins. The third Star Coin is under a ledge. Run and fly under the ledge, stick to the wall, then boost to it, then wall jump to safety. Go right and under a ledge for a green pipe to the red goal. This opens the path to the Fort and a red switch. Otherwise, keep going to the right and swing from a chain to the regular goal. This opens the path to the Fort through the blue switch.