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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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The Godelian Puzzle Book

ISBN 10 : 9780486497051
ISBN 13 : 0486497054

These recreational logic puzzles provide entertaining variations on Gödel's incompleteness theorems, offering ingenious challenges related to infinity, truth and provability, unde..


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 Military Puzzle Book

ISBN 10 : 1849536384
ISBN 13 : 9781849536387

Flex your brain with crosswords, Sudoku, anagrams, and other puzzles, perfect for those serving their country at home or abroad Test your problem-solving skills and hone your menta..


The Times Quiz Book

ISBN 10 : 9780008209551
ISBN 13 : 0008209553

Do you have the general knowledge to match double world quiz champion? More than 200 challenging quizzes and 4000 questions from the MindGames section of The Times will test you to..