The ultimate Sudoku title: not just a puzzle book, but a comprehensive encyclopedia of the phenomenon to date, featuring every major variant ever created. Here you will find close to 150 different kinds of Sudoku in 495 puzzles, including Killer Sudoku, Skyscraper Sudoku and multi-grid Samurai Sudoku. No other collection of Sudoku comes close; this is without doubt the most definitive volume of Sudoku variants ever compiled. Another blockbuster from the puzzle master behind the bestselling Mammoth Book of Sudoku.