Challenge your brain with these enjoyable puzzles.The latest puzzle book in The Times Fiendish Su Doku series – previously unpublished, quality Su Doku puzzles. Includes 180 Fiendish and 20 Super Fiendish puzzles.You don’t need to be a mathematical genius to solve the treacherous puzzles in this collection of Fiendishly difficult puzzles – it’s simply a question of logic.Since the first Su Doku puzzle appeared in The Times in November 2004, this classic game of logic has become a phenomenon, with over 5 million copies of the Times Su Doku series sold worldwide.Perfect for the advanced solver in need of a constant supply of ultra-difficult puzzles, and guaranteed to provide hours of mind-stretching entertainment.