These are previously unpublished quality Su Doku grids from the puzzle providers to The Times, and help to develop you to take on Extreme Su Doku. The 200 puzzl

A new collection of previously unpublished Fiendish Su Doku puzzles with the added bonus of 25 Super Fiendish puzzles Perfect for the advanced solver in need of

The 200 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 b

Challenge yourself with number puzzles Previously unpublished quality Su Doku grids from The Times, which help develop your skills to take on Extreme Su Doku. T