This book has 100 Hard and Extreme Sudoku 16 X 16 Puzzles. Challenge yourself today with Sudoku Hard & Extreme Level Puzzles!Sudoku is a fun and addicting logic puzzle game for improving your memory and prevent neurological disorder.This book is ideal for advance solvers, will love to solve this difficult Mega Sudoku 16x16 puzzles. Only 1 print per page. It is also ideal for those wanting to move on from the "Medium" difficulty level and try a more challenging set of puzzles that require some advanced solving techniques.Features:50 Hard Level / 50 Extreme LevelLarge Size: 8.5 x 11 inchesPremium glossy coverEasy to readSolutions includedThis book is the perfect size for traveling so feel free to take it on the go with you!Kws: sudoku puzzle books, sudoku book, books sudoku, suduko puzzle book, super sudoku, sudoku puzzle books difficult, monster sudoku, mega sudoku puzzle books, big sudoku puzzle books, sudoku x, sudoku hard, big sudoku book