King Ka-thunk's Castle

King Ka-thunk's Castle (known in the British English version as King Kathunk's Castle), or , 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.

Layout
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.

Green Stars

 * Green Star 1: The player must activate the Green Ring and collect all eight Green Coins to reveal the Green Star.
 * Green Star 2: After the checkpoint, the second Green Star can be found inside a Ka-thunk. (See picture)
 * Green Star 3: The player must use the Cat form to climb a wall right next to the second Warp Box to obtain the Green Star.

Stamp

 * Not far from the second Green Star, the player must use the cat form to climb the wall next to the rotating Ka-thunks. The stamp is a Chargin' Chuck.

Names in other languages
König Klonks Kastell