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π NEW LEVELS: we have hired Sudoku experts to create correct levels for each puzzle (most of the books have mismatched levels).π TODAY FREE BONUS PUZZLES: this book contains 1010 puzzles + other 1000 free printable sudoku puzzles.β HAVE FUN AND IMPROVE YOUR BRAIN ACTIVITY: boost your focus, memory and mental health.β PUZZLE BOOK FOR ADULTS: larger print than ordinary books, it has a size of 8.5 x 11 inches.β CARE OF DETAILS: Sudoku rules, margins on the left are larger to allow you to cut pages, solutions in the back.β FOR ALL LEVELS: 100 beginner, 100 easy, 100 medium, 200 tricky, 200 hard, 300 diabolical, 10 killer.β 236 PAGES: each page has been designed to allow you to have many puzzles in a single book.β IDEAL GIFT: brain games for adults or an adult activity book like this are usually perceived as much appreciated gifts!The puzzle difficulty Levels in this book are follows:The BEGINNER puzzles are for SUDOKU newbies. The puzzles have less than 15 or so unsolved cells. These puzzles can be solved just by searching for Naked Singles. (Naked singles are cells that have only one possible value). Solving them is very easy and are a great introduction to Sudoku.The EASY puzzles are similar to the BEGINNER puzzles but they have more unsolved cells. They still only require naked singles and are easy to solve. MEDIUM puzzles are where the challenges begins! These require the use of Naked Singles, Naked Doubles, Naked Triples, and Locked Candidates (also called Pointing Pairs).TRICKY puzzles are similar to MEDIUM puzzles but they have fewer "givens". (Givens are the numbers already present in the puzzle). They use the same solving techniques as the MEDIUM puzzles but will be more challenging.HARD puzzles require an ADVANCED SOLVING TECHNIQUE (such as X-WINGS, XY-WINGS, W-WINGS, SWORDFISH, SKYSCRAPERS, TURBOT FISH, UR's (Unique Rectangles), etc). You might need to do some research about these techniques before tackling these HARD puzzles. These puzzles are for very experienced sudoku users.DIABOLICAL puzzles are similar to HARD puzzles but they require multiple advanced solving techniques. These puzzles are for experts!KILLER puzzles are quite different, so to solve them, in this book we recommend to read our blog article.GET THIS GREAT SUDOKU BOOK TODAY ON OFFER!