Lemmy's Lights-Out Castle
From the Super Mario Wiki
Lemmy's Lights-Out Castle, or Acorn Plains-Castle is the Castle level of Acorn Plains in New Super Luigi U. It is unlocked by completing Piranha Heights or Piranha Gardens and its own completion opens the way to Spike's Tumbling Desert.
The castle is mainly composed of platforms swinging left and right. As the name indicates, there is almost no light in the castle, except for several lights that are either static or swinging. Munchers appear in this level for the first time. Lemmy Koopa serves as the boss of this castle, and the battle is exactly the same way as in New Super Mario Bros. U.
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