This book will keep even a Sudoku expert busy. You will experience extremely difficult Classic Sudoku 9x9, Sudoku 10x10, Large Sudoku 12x12, Sudoku 15x15 and Mega Sudoku 16x16. You get the perfect mix of different sizes of Sudoku to keep you entertained for weeks. Once you pick up this book, you won't be able to put it back down. You have been warned!Sudoku Mixed Grids Deluxe - Extreme is a collection of 476 puzzles: 88 extreme Classic Sudoku 9x9 puzzles 88 extreme Sudoku 10x10 puzzles 88 extreme Large Sudoku 12x12 puzzles 88 extreme Sudoku 15x15 puzzles 88 extreme Mega Sudoku 16x16 puzzles 36 extra logic puzzles I guarantee that every logic puzzle in this Sudoku puzzle book has been carefully checked to ensure that each puzzle has only 1 solution.None of the puzzles in this book will appear in any of the other PuzzleBooks.net books.Sudoku is also known as Number Place, Nanpure, Su Doku. Quite often Sudoku is misspelled as Suduko, Soduko, Sodoku, Sudoko, Suduku and Soduku.