Times Fiendish Su Doku Book 6

<p>You don't need to be a mathematical genius to solve the puzzles in this, the sixth collection of Fiendishly difficult puzzles, it is simply a question of logic. 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 TIME SU DOKU series sold worldwide. The puzzles in the collection are of the highest quality - from the puzzle suppliers to THE TIMES. Perfect for the advanced solver in need of a constant supply of ultra-difficult puzzles, and guaranteed to provide hours of mind-stretching entertainment.</p>