Go through the grand hall
From the Super Mario Wiki
Go through the grand hall is the fourth story of an additional chapter two in the game Wario Land II. It is set in Wario Castle after the Black Sugar Gang have taken over the place. Wario traverses yet another set of castle rooms. This stage features some rooms that are bigger and more complex than the ones before.
Hidden treasure: Brush
The hidden treasure of this level, the Brush, is located to the far left of the goal door. The player just has to head left and smash through the breakable blocks that block his way.
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