To the castle!!
From the Super Mario Wiki
To the castle!! is the first story of an additional chapter two in the game Wario Land II. It takes place on the now pirate-infested outskirts of Wario Castle which resemble a forest area. The player should be careful to avoid the numerous enemies there.
Hidden Treasure: Medicine Pill
The hidden treasure of this level, the Medicine Pill, is located at the top right of the first area with ball-throwing Penguins. The player has to smash through the wall of Enemy Blocks in order to get there. Getting a Penguin to the spot can be kind of tricky since the ceiling is very low at the top area.
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