Captain Toad starts out in front of a bridge to a small temple. There's a gem on it. If you step on the bridge, it will collapse. Drop down to the right and walk on the spinning platforms in the water. Use the first one to cross to the left to reach the first gem. Cross the water to the temple. If you fall into the water, there are some coins. When you get out of the water, you'll have to dodge or stun a Walleye with a turnip to pass through a doorway under the bridge. There's a plant outside that will give you a Mushroom. Go through the doorway and you'll see two rotating hallways. Wait until the left one aligns horizontally so you can go through the doorway behind it. This will take you outside to a set of stairs. Go up the stairs and through the doorway at the top. This will take you to the right rotating hallway, which doesn't always let you progress. If you cross go through the doorway just to the left, you'll find several coins. If you stand in the hallway when it is vertically aligned, you'll drop down to a hidden area. Pick the plant for the second gem. Return through the rotating hallways and you'll reach a set of two rotating doorways. Stand in one to reach the top of the temple. There are two Walleyes here. Stun them with turnips or dodge them. On the edge of the bridge is the third gem. At the top of the stairs behind the second Walleye is the Star.
Special Challenge: Do not destroy the bridge.