The Mammoth Book of Secret Code Puzzles: B Format (Mammoth Books)

The Mammoth Book of Secret Code Puzzles: B Format (Mammoth Books)
sku: COM9781845293253USED
$7.17
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   Description
This text presents a collection of cryptograms & other enciphered challenges to satisfy various levels of puzzle aficionado. It features over 600 puzzles, from the simple substitution-code type - where each letter stands for another - to difficult ciphers using actual wartime methods employed by historic figures.

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