hit tracker

The GCHQ Puzzle Book


Puzzle Book

ISBN 10 : 0718185544
ISBN 13 : 9780718185541

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The Gchq Puzzle Book

ISBN 10 : 9780718185558
ISBN 13 : 0718185552

** WINNER OF 'STOCKING FILLER OF THE YEAR AWARD' GUARDIAN ** Pit your wits against the people who cracked Enigma in the official puzzle book from Britain's secretive intelligence o..


Bletchley Park Brainteasers

ISBN 10 : 9781472252586
ISBN 13 : 1472252586

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Challenging Logic Puzzles

ISBN 10 : 1402705417
ISBN 13 : 9781402705410

So, you think you've got the brain-power to tackle tough logic puzzles? Well, try this extraordinary assortment of challenges, including Mix-and-Match logic puzzles and "Find the L..


The Penguin Book Of Puzzles

ISBN 10 : 9780718188610
ISBN 13 : 0718188616

A collection of challenges from throughout history, featuring some of the greatest ever puzzle masters. A Sumerian Riddle (circa 18th Century) There is a house. The blind enter it ..


The Codebreakers

ISBN 10 : 9781439103555
ISBN 13 : 1439103550

The magnificent, unrivaled history of codes and ciphers -- how they're made, how they're broken, and the many and fascinating roles they've played since the dawn of civilization in..


Sherlock The Puzzle Book

ISBN 10 : 9781473531079
ISBN 13 : 1473531071

‘Dear God, what is it like in your funny little brains? It must be so boring.’ Can you pit your wits against the best and the wisest? Through these 200 puzzles and challenges, ..