King Ka-thunk's Castle
From the Super Mario Wiki, the Mario encyclopedia
King Ka-thunk's Castle (known in the British English version as King Kathunk's Castle), or World 5-Castle, is the third castle level of Super Mario 3D World and the ninth course in World 5. It is unlocked via completing Searchlight Sneak, and its own completion frees the purple Sprixie Princess who builds a Clear Pipe to World 6. This is the only castle level in the game that does not need to be unlocked with Green Stars.
This level starts on a platform with some Ka-thunks nearby, with some ? Blocks in sight. After navigating past some Chargin' Chucks and moving platforms, a nearby Warp Box takes the player to an area with some more Ka-thunks and the Checkpoint Flag. The player now needs to avoid Ka-thunks that come out from crevices in the wall, as well as more Chargin' Chucks. A nearby Warp Box brings the player to King Ka-thunk. After his defeat, a Warp Box transports the player to the purple Sprixie Princess and a Goal Pole.
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