Defeat the giant spear man (Uncanny Mansion)
From the Super Mario Wiki, the Mario encyclopedia
The player starts in a central room with five different doors. Each door has the face of an enemy imprinted over it. Whenever Wario re-enters the center room through one of these doors, the type of enemy painted over the door will appear in the room. The areas behind the door house different enemies and sometimes dark areas. Behind the door with the Grunt picture above, a switch that turns all the lights on can be found. After that the different rooms can be visited again to find new things and eventually the giant spear man.
Hidden Treasure: Wall Clock
The hidden treasure of this level, the Wall Clock, can be found behind the door under the picture of Inamazu. After the player turned on the light, platforms become visible in that room that can be climbed to find a way to the treasure door on top. The player should be careful about the zombie.
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