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The New York Times Strictly Medium Crossword Puzzles Volume 1 200 Medium Puzzles

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The Cypher Files

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The Dictionary of Difficult Words

Jane Solomon

Roald Dahl's Matilda's How to be a Genius

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The Telegraph Big Book of Cryptic Crosswords 3

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The Who Was? Activity Book

Jordan London

The GCHQ Puzzle Book II

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Can You Solve My Problems?

Alex Bellos

The Penguin book of puzzles

Gareth Moore

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Sinclair McKay

The GCHQ Puzzle Book

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The World's Worst Children

David Walliams

What Colour is the Sun?

Brian Clegg

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Stig Arnesen

Donald Duck Quiz

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Alice's Puzzles in Wonderland

Richard Wolfrik Galland

Sherlock Holmes' Elementary Puzzles

Tim Dedopulos

Vortex

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Chambers Crossword Dictionary Over 500,000 Solutions for Every Kind of Crossword

Aidan Chambers

The Sherlock Holmes Puzzle Collection

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IQ hjernetrim

Joe Cameron

Stor kryssordbok

Daniel Danielsen

Kryssordbok

Daniel Danielsen

The complete book of fun maths

Ken Russell

That book

Mitchell Symons

Kryssordspesialisten

Jarle Schwach

Kryssordleksikon

Giant Book of Mensa Mind Challenges + Giant book of challenging thinking puzzles

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Simon Melhuish

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Svein Erik Olsson

Kryssordløseren

Tormod Ropeid

Damms kryssordløser

Arild Feldborg

Mathematical bafflers

Angela Dunn