Toadette finds herself in a caged-in area with some Conkdors. There are four Conkdors lined up in a row near the start. The first gem is in front of the third Conkdor from the left. You'll have to be quick to get it. Drop down on the right side and go through the yellow pipe on the left side. You'll be on an upper level. Drop down to stomp on the leftmost Conkdor, then go through the yellow pipe on the right. This leads you to a spinning cylinder that you walk in to rotate, like a hamster wheel. There's a hole in one part of the cylinder. Drop into the cylinder, then rotate it until the hole is at the bottom. Drop through and you'll land on a yellow platform. Drop down towards the row of Conkdors and pull the handle. This will make the Conkdors rise to the upper level. Drop down to the ground and go through the yellow pipe on the left. Let the Conkdors break the bricks for you. The second gem is in the plant on the far right. Drop down where the leftmost Conkdor used to be and you'll find a ladder to another cylinder. Roll it to the right to reach the third gem, then drop in through the hole. Roll the cylinder to the right and exit the cylinder. Near the corner, you'll find a hidden Gold Mushroom. Drop down to the Star.
Special Challenge: Find the hidden Gold Mushroom.