A practical guide by two world experts to codebreaking and solving cryptograms. There are tens of thousands of such cryptograms, both modern and historical, many of which remain unsolved. The guide is complemented by both success stories and details of unsolved encryption mysteries.
Quiz your family at home with crosswords, puzzles and games. Run your own pub quiz with 500 brand new general knowledge quizzes. With 10,000 questions arranged in easy, medium and difficult categories, you can set the pace as quiz master for your friends and family, or pit yourself against the Collins Quiz Master in a battle of wits.
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