Bol Partner
Warning! Only the most skilled sudoku experts should try these mind-blowing puzzles! In this series, you will find puzzles truly worthy of the label "hard." The four volumes of this series range from Level 1 to Level 4, increasing in difficulty with each book. At Level 1, you'll prove that your solving skills are up to bar before proceeding further.
AmazonPagina's: 160, Spiral-bound, Tallis Street Books
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