Ludwig's Block-Press Castle
From the Super Mario Wiki
Ludwig's Block-Press Castle, or Meringue Clouds-Castle, is the castle of Meringue Clouds in New Super Luigi U. It is unlocked by completing Three-Headed Snake Block and its own completion unlocks Bowser Jr. Showdown.
The player starts in an area with a ? Block and Ludwig's icon in the wall. the player will the approach several platforms, Bony Beetles and Fire Bars, while a giant block tries to crush the player. After that is an area with a Stone Buzzy on top of three Brick Blocks. More platforms, Fire Bars, Stone Buzzies and another giant block appear. The player will soon find themselves at the boss door. After boarding Ludwig's airship, he will clone himself twice. After jumping on the real Ludwig three times, he will be defeated.
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