The ideal gift for su doku enthusiasts. Posing an even greater challenge than Fiendish Su Doku puzzles, this bumper collection of more than 360 puzzles is for h

The ideal gift for su doku enthusiasts. If you like to live dangerously and push beyond your mental comfort zone, steel yourself for The Times' toughest Ultimat

For those who like to live dangerously and push beyond their mental comfort zone, steel yourself for The Times' toughest Ultimate Killer puzzles. A bumper colle

Have you worn out all of your pencils mastering ever-changing Sudoku puzzles? Have you stepped up your game to the next level and now seek something a little mo