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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 Deutschland
 Amazon France
 Amazon España
 Amazon Italia

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