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Calcudoku:4×45×56×68×89×97×7Killer SudokuSudoku
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29 May 2012   Show solution   Rating: 0 () Points: 1 (solved 147 time(s) so far)
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The last 20 solved puzzles (       = by subscriber):total
Cell size for 4×4:  small medium large
   

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This type of puzzle is known as Calcudoku, Newdoku, Rekendoku, MathDoku, Kashikoku-Naru, KenKen, Kendoku, Sumdoku, Calkuro, K-Doku, Keen, NekNek, CanCan, Square Wisdom, Emono, Minuplu, LatinCalc, Yukendo, ArithmeGrid, Hitoshii, Inky, SquareLogic, TomTom, and if you know of any other names, let me know :-). Of these names, "KenKen" and "KenDoku" are trademarks of Nextoy LLC. Note that this is a hobby site, and is not affiliated with Nextoy nor their brands.
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Many more Sudoku variations are at Planet Sudoku.