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

101 difficult puzzles: with zero, single operator, with modulo, twin puzzles, many 10×10 and 12×12 puzzles, and one 15×15
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.comlulu.com