Escape from Maze Woods
From the Super Mario Wiki
Escape from Maze Woods is the fourth story of chapter three in the game Wario Land II. It is another forest area and it features another river with a turtle, just how stage 3-2 did. The level also introduces a new species of enemies, the bees. If they happen to sting Wario, his head swells to abnormal proportions and he slowly gains height until he hits something solid.
Hidden treasure: Big Face
The hidden treasure of this level, the Big Face, is located in the area with the goal door. The player has to let Wario assume his puffy form by let him get stung by a bee. He can then float to the right side of the room where he finds the treasure behind some breakable blocks.
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