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

With every puzzle requiring upper-level strategies, this collection packs even more of a punch than Beyond Black Belt Sudoku. You'll encounter common advanced t

From Nikoli, the Japanese puzzle company that created the sudoku craze, comesa title that starts at hard and goes to a level of difficulty not seen in anyprevio

The vast majority of sudoku puzzles that are labeled hard, expert, challenger, are not really all that difficult. And in a surprising number of cases, they are

SUDOKU: The hotter-than-hot puzzle phenomenon that everyone wants to play! Sudoku’s everywhere these days, and winning millions of converts worldwide. And why