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Puzzle types:NEW

The ideal holiday puzzle book, with 250 puzzles (!) in many variants: puzzles with zero, twin puzzles, extra large puzzles (up to 12x12!), and much more. There are 50 easy puzzles, 150 medium, and 50 difficult (score 10 points for solving each of those), sorted in increasing order of difficulty.

121 puzzles for the advanced solver: twin puzzles, extra large puzzles (up to 17×17!), with exponentiation, modulo, without operators, etc. Score 12 points on the site for each correct solution.FREE

100 free puzzles: ideal to get started with Calcudoku's. One hundred puzzles from 3×3 to 9×9, ranging from very easy to quite difficult.

250 (!) Killer Sudoku puzzles, from easy to difficult. For each of the 75 difficult puzzles you can score 9 points on the site.
As paperback:
 Amazon US


 Amazon UK


 Amazon Deutschland
 Amazon France
 Amazon España
 Amazon Italia

 Amazon US


 Amazon UK

 Amazon Japan
 Amazon Deutschland
 Amazon France
 Amazon España
 Amazon Italia


 Amazon US


 Amazon UK

 Amazon Japan
 Amazon Deutschland
 Amazon France
 Amazon España
 Amazon Italia
As PDF download:lulu.com