From the Super Mario Wiki
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In this stage, there are fences and slimy puddles of unknown green sludge. The stage has a many Red Boos in the background. When the player reaches a foggy area, he or she will have to summon the other characters to blow away the fog. To do this, the play must say "wave" ten times. The path that follows contains a Metal Mushroom, which can easily get the player through the rest of the path. Then the player will reach a dark room and will need to summon the other characters to light it up. To do this, the player must say "spin" ten times. This lights a chandelier and gets rid of the Red Boos blocking the player's path.