The Times Difficult Su Doku Book 3

A collection of 200 previously unpublished Difficult Su Doku puzzles of the highest quality from the Su Doku suppliers to the "Times" newspaper, this book is guaranteed to provide hours of absorbing, brain-stretching entertainment. One need not be a mathematical genius to solve these puzzles; it is simply a question of logic. Each puzzle has a unique solution--and there's no guesswork required.