Gift a Times puzzle book for the Su Doku fan in your family this Christmas. Test your powers of logic with these challenging Su Doku puzzles. The latest book in The Times Fiendish Su Doku series - previously unpublished quality Su Doku puzzles.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. Perfect for the advanced solver in need of a constant supply of ultra-difficult puzzles, and guaranteed to provide hours of mind-stretching entertainment. * The more difficult books in the series tend to sell most strongly, as puzzle enthusiasts look for an appropriately tough challenge, and the quality of Times puzzles * From The Times, the No.1 for Su Doku.