New Super Mario Bros. U: Soda Jungle- Ghost House -- Which-Way Labyrinth

This Ghost House is another maze of doors. There are five doors in the first part of the room. The fastest way out of here is as follows: Take the lower left door. This leads to a dark room with a rising floor and Boos. One of the item blocks has a Yellow Baby Yoshi. Hold Yellow Baby Yoshi and spin to light up the room temporarily. It also eats Boos. As the floor rises, stay to the left. When the floor gets close to the ceiling, there is an invisible area on the left side, so you won't get crushed. Quickly run to the right and go through the door. This leads to another dark room with Boos. The floor will drop out from under you and you'll start falling. You'll land on a level that will also disappear. Quickly run to the right before the floor disappears and you'll reach an invisible area with the third Star Coin. At the bottom is the door to the red goal. This opens the path to Soda Jungle- Parabeetle.

To reach the regular goal and get the other two Star Coins, go through the upper right door. It leads to a dark room with a couple of Broozers, that will punch barrels at you. In the center of the room is a floor that will descend when you stand on it. While it descends, go to the left for the first Star Coin, avoid the Broozer, then jump back up and make the floor descend again. This time, go to the right to a door that will take you back to the first room with five doors. This time, take the lower right door, which leads to a dark room with rats. You'll only be able to see their eyes glow at first, but to the right is an item block with another Yellow Baby Yoshi. In this room, you'll move right to left. The P-Switch makes Silver Coins appear. Go past the door you see at ground level and go up and to the left to a hidden area that leads to the upper door. This bring us to a part of the Ghost House that's above the five doors. Go up the stairs and up and over to the left of the door at the top of the stairs. You'll drop down to the second Star Coin. Wall jump out, then go through the lower door. This leads to a room with a tilting floor that descends. There's a giant Boo or two in the room. The floor will drop to the level of an item block with a Starman. Put the Starman to good use until you reach the door at the bottom. This leads to the regular goal, opening the path to Soda Jungle-4 and -5.