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Puzzle types:NEW

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 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