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

A new collection of previously unpublished Fiendish Su Doku puzzles with the added bonus of 30 Super Fiendish puzzles.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

These previously unpublished quality Su Doku grids from the puzzle providers to the Times are ideal for helping to develop the skills needed to take on Extreme

Forget your classroom nightmares and discover how numbers can enhance and illuminate your world! How can math help you bet on horses or win in Vegas? What’s t

200 New Puzzles -- From Fiendish to Super Fiendish Su Doku, "the crossword without words," comes with a warning: it is seriously addictive. You don't need to be