Storm the castle!! (Syrup Castle)
From the Super Mario Wiki
Storm the castle!! is the second story of chapter five in the game Wario Land II. It takes place in the Black Sugar Gang's base, Syrup Castle. It is also notable for being the level featuring the most abilities in one stage (with four in total). Wario starts in an outside area full of cracked pillars, but he will come across flooded rooms and inner corridors of the fortress.
Hidden Treasure: Mantle
The hidden treasure of this level, the Mantle, is located in the first of the big flooded rooms. Above the big platform between the two Skullcopters, a couple of small platforms leading up can be found. The player has to climb these platforms, head left and evade the Skullcopters on the way to the treasure door.
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