The ultimate Sudoku book: not just a puzzle book, but a comprehensive encyclopedia of the phenomenon to date, featuring every significant variation ever created. Here you will find nearly 150 different types of Sudoku in 495 puzzles, including Killer Sudoku, Skyscraper Sudoku, and multi-grid Samurai Sudoku. No other Sudoku collection can compare; this is undoubtedly the most definitive volume of Sudoku variations ever compiled. Another blockbuster from the puzzle master behind the bestseller Mammoth Book of Sudoku.