The fourth instalment in the fiercely popular bestselling Fiendish Su Doku series. A new collection of previously unpublished Fiendish Su Doku puzzles with the added bonus of 25 Super Fiendish puzzles.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 puzzles & guaranteed to provide hours of absorbing brain-stretching entertainment. The puzzles in this collection are of the highest quality & supplied by Puzzler Media the Su Doku suppliers to The Times newspaper. Since the first Su Doku puzzle appeared in The Times in November 2004 they have become a phenomenon with over 5 million copies of The Times Su Doku books sold worldwide. You dont need to be a mathematical genius to solve these puzzles; it is simply a question of logic. Each puzzle has a unique solution -- & theres no guesswork required. The Times Su Doku remains the original the best & the market leader.