The Scary Sudoku Book is a specially created collection of 300 of the toughest puzzles you have ever seen. If you love killer Sudoku puzzles, then this book will give you hours of excrutiating and hair-raising challenges, along with well-earned satisfaction as you successfully work your way through it. You should be familiar with a broad range of sudoku solving techniques to ensure maximum enjoyment from these puzzles. Once again, don't say I didn't warn you You may end up crying for help or begging for mercy, in your attempts to solve the toughest puzzles in this book. Best of luck The BUYSUDOKUBOOKS.COM guarantee. Often you find sudoku books with puzzles that have more than one solution. This can waste a lot of time and drain a fair amount of ones sanity when it comes to solving a puzzle. Have no fear To ensure minimum frustration, every puzzle in this book has been carefully checked and is guaranteed to have only one solution.