World 4-Ghost House (New Super Mario Bros. Wii)
From the Super Mario Wiki
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In this level, at the start, the floor moves up or down when the player stands on it. At the left side of the beginning of the level, a Super Star can be found. Enemies found here include Boos and Scaredy Rats. The player must then hit a P Switch on the ceiling in a hidden alcove which requires standing on the floor which moves up. This enables access to the door leading to the next area. Through this door is a long area of stairways going up and done, where many clusters of Scaredy Rats run along. Past the area is the flagpole.