The Times Fiendish Su Doku Book 4

A new collection of previously unpublished Fiendish Su Doku puzzles with the added bonus of 25 Super Fiendish puzzles

 

Perfect for the advanced solver in need of a constant supply of ultra-difficult challenges, the puzzles in this collection are of the highest quality, guaranteed to provide hours of absorbing, brain-stretching entertainment. Supplied by Sudoku Syndication, the Sudoku suppliers to the London Times newspaper, each puzzle has a unique solution—and there's no guesswork required.