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

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

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

The latest volume in the hugely popular Killer Su Doku series from The Times, featuring the highest-quality puzzles with an extra element of arithmetic. This ad