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And puzzlers who have completed the first level of sudoku can graduate to these more second-degree puzzles. White and Green belts can keep honing their skills, while Brown and Black will get a new and greater challenge!
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February 09, 2009:
I am a confessed Sudoku addict. I have been looking for a book that
doesn't have any easy or medium puzzles, but all hards ones. I was very
happy to come across this one at Barnes and Noble and bought it for myself as a Christmas gift. This book will not disappoint if you are lookoing for a challenge.
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July 15, 2008: I found this book to be very challenging but not impossible. There were a few puzzles that I had to look up the answer, otherwise, I would have guessed. I really enjoyed doing these.