200 Difficult Sudoku Puzzles

This book contains 200 difficult Sudoku puzzles, including solutions and clues. All of the puzzles in this book are made by hand and carefully tested to make sure they are difficult but not impossibly so. You should be able to solve one of the puzzles in under 30 minutes. That means this book can keep you occupied for up to 100 hours! The book also includes a few examples on how to solve Sudoku puzzles to get you started in case you've bought this book without ever having solved a Sudoku before. If that is the case, the clues may also be of help. However, this book is intended for the reasonably experienced Sudoku player.