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Rosalina near two Ka-Thunks.

Ka-Thunks[1] are obstacles that appear only in the courses King Ka-Thunk's Castle and Bowser's Lava Lake Keep in Super Mario 3D World. Ka-Thunks resemble spiky blue squares which hurt the player upon contact. They usually spawn in small crevices and move along a set path until they fall into an abyss. They cannot be destroyed by any means, including invincibility, excepting the pair of Ka-Thunks in Bowser's Lava Lake Keep defeated by defeating a pair of Hammer Bros.

King Ka-Thunk uses one of these during his battle.


  1. ^ Super Mario 3D World Prima guide, page 27