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KenKen and KenDoku are trademarked names for a style of arithmetic and logic puzzle invented in 2004 by Japanese math teacher Tetsuya Miyamoto,[1] who intended the puzzles to be an instruction-free method of training the brain.[2] The name derives from the Japanese word for cleverness (賢, ken, kashiko(i)).[1] The names Calcudoku and Mathdoku are sometimes used by those who do not have the rights to use the KenKen or KenDoku trademarks.[3][4]
- ^ a b A New Puzzle Challenges Math Skills, New York Times, February 8, 2009
- ^ Tetsuya Miyamoto creates KenKen. Train your brain, The Times, 21 March 2008
- ^ "KenDoku renamed to CalcuDoku". Conceptis Puzzles.
- ^ "Puzzle Madness: Frequently asked questions". Archived from the original on 2021-01-19. Retrieved 2015-04-08.