Perfect to lose yourself in while you're taking a break, this book of addictive puzzles ranges from easy to brow-furrowingly fiendish. Devised by Wayne Gould, the original creator and leading authority on su doku puzzles.

There are puzzles here for all levels ranging from easy, through mild and difficult to fiendish, plus Wayne Gould's guide to solving su doku, to give you all the tips and techniques you need to crack the next level. Better for you than a biscuit, Coffee Break Su Doku will satisfy on every level.