About this set:
From easy to hard in every book. This set of books includes 660 sudoku puzzles , arranged in order of difficulty.
Handy, Pocket books , paperback format that you can take anywhere.
Answers for each sudoku puzzle are included.
Publisher:Knowledge Publishing House (Nov,2017)
Paperback: 160 pages / book
Product Size: 14.3x 10.5 x 5.7cm/5.6 x 4.1×2.2in
Product weight: 500g
6 books / set