Find the exit!!
From the Super Mario Wiki
The goal door of this level is visible right from the start, but there is no way to access it from there so the player has to take a detour to reach it. A prominent feature in this level is the fat-ability which is used to activate elevators. The light switches from Stage 2-1 also return here.
Hidden treasure: Pearl Amulet
The hidden treasure of this level, the Pearl Amulet, is located in the area right after the flooded passage with the currents and the Swordfish. Wario must head right, avoid the Cook's cakes and smash through the blocks in the wall in order to reach the treasure door.
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