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.
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.