The vast majority of sudoku puzzles that are labeled "hard,"
"expert," "challenger," are not really all that difficult. And in a
surprising number of cases, they are downright easy. In the
"Absolutely Nasty Sudoku" books, you will find puzzles truly worthy
of the label "hard." The puzzles increase in difficulty throughout
the four books in the series. It ranges from basic and intermediate
puzzles and techniques at Level No. 1, to the most advanced
techniques at Level No. 4, along with puzzles that require multiple
advanced techniques each time.
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