200+ supercharged Sudoku to test your skills--and boost your brainpower! Whether you're already a pro or you're looking to build your abilities, The Toughest Su

"If you have to ask, IT'S TOO HARD FOR YOU"--Cover.

Black paper sudoku puzzle book As cool as sudoku already is, we thought we'd make things about 100 times cooler by creating the first-ever black paper sudoku bo

Can't get enough of Sudoku? This book is for you! It contains three hundred challenging and devilishly difficult Sudoku puzzles in a portable paperback. Feature

Edited by crossword great Shortz, this beautiful book offers 400 easy-to-hard puzzles in a convenient portable size, perfect for carrying in a purse, briefcase,