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KenKen Puzzle - Super hard, handcrafted "no op" 9X9 puzzle using just addition and subtraction. Like this puzzle? Sign up to have fresh handcrafted puzzles arrive in your inbox on the 1st
No one I know cares, but I finally broke 6 minutes on 9x9 Expert KenKen! Been 3 years stuck in 6 minute best time. : r/puzzles
Will Shortz Presents The Dangerous Book of KenKen: 100 Very Hard Logic Puzzles That Make You Smarter (Paperback) | Hooked
KenKen Puzzle Official Site - Free Math Puzzles That Make You Smarter!