The Curious Factory is the first level of the Ruby Passage from Wario Land 4. It is the sixth level in total. It is a labyrinthic factory with robot-like enemies. Wario can use the Flaming Wario transformation after take contact with a Kaentsubo.
This Level's Music can be found in the Warioware Inc.: Minigame Mania Game Paper Plane without the machiney sounds.
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