Sudoku Most Foul

Sudoku can be a lot harder than many puzzle makers give it credit for. What most books and newspapers call "hard" isn't even the beginning. Sudoku communities online have been exploring puzzles far beyond mere evil, and the advanced techniques to crack them. If you think you're a sudoku master, this is the book to challenge that assumption. 150 difficult puzzles will put your mettle to the ultimate test. A detailed solution section shows exactly what it takes to break each puzzle open.