The puzzles in this collection of treacherously difficult puzzles will stretch even the most advanced Su Doku enthusiast. You will need to use all of your best

These previously unpublished quality Su Doku grids from the puzzle providers to the Times are ideal for helping to develop the skills needed to take on Extreme

A new collection of previously unpublished Fiendish Su Doku puzzles with the added bonus of 30 Super Fiendish puzzles. Perfect for the advanced solver in need o