In order to avoid any further confusion with KenKen(R) and KenDoku(TM) trademarks of Nextoy, LLC, I have changed the name of these puzzles to CalcuDoku. This name is also used by other publishers but it is not trademarked.
Puzzle book for 2013!
10% discount in UK!
but wait! ALSO 10% discount on Amazon.com!
Sample Puzzles!
FREE Puzzles!
FREE Sudoku variants!
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