New Super Mario Bros. U: Meringue Clouds- Ghost House -- Spinning Spirit House

This Ghost House is yet another maze. First, go through the door at the top before the Boos approach you. This leads to a room with three levels and several doors. This is where the maze begins. You can go through some of the walls, but not others. If you go to the right, you can reach the item block with a power-up. Hidden behind the wall you just passed through is a door. It leads to a room that's a spinning square. It will move to the right, past Boos and doors. The first door you'll come across is fake. The second door will return you to the same room with many doors. This time, you can go through different walls, but you cannot reach the item block any more. You can now access the door on the second level, on the left. It leads to a room with a descending floor and a Broozer. Let the Broozer live, because it can break open crates for coins. Keep it on the right side of the room so it can destroy the stones guarding the first Star Coin. The door at the bottom returns you to the room with many doors. On the second level, behind the middle wall is a spring to the third level. That door take you to a room with poles and fake item blocks that will attack you. Go through the door in the upper right corner. This will take you back to the room with many doors. You can now go to the right door on the third level. This room has a rising, tilting floor with a ring of Boos. The coins on the sides will move to the other side, where you can get them. The second Star Coin starts on the right side, but will move to the left side if you try to get it. Make the Star Coin move to the left side, then go to the left side to get it. The door at the top will return you to the room with many doors. From where you are, go down the stairs (which are hidden) and to the left for another door. This will lead to another spinning room with fake item blocks and Boos. The room will drop past a Big Boo and stop at a door. This will take you to the regular goal. This opens the path to Meringue Clouds-4, -5, and -6.

To get the third Star Coin, follow the path above until you exit the room with the poles. Go to the right, down the stairs, and to the left. On the far left wall, wall jump up to a hidden door. This leads to a room with hidden areas in the floor. Go to the far right first to access the hidden area, then hit the P-Switch on the left wall. A trail of Silver Coins will lead you to the third Star Coin. Use the spring to get it. The door leads to the red goal, which opens the path to the castle.

To reach Meringue Clouds-4, -5, or -6, approach the clouds in the gap between the Ghost House and those levels. Rainbows will appear, as well as an item block and Fuzzies. Memorize the path you want to take (probably to the item block) and step on the cloud at the start of that path. Once you move forward, Mario will run ahead and you can't steer. Meringue Clouds -4 is the level near the back, -5 is near the front, and -6 is in the middle.