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Crack for Charity — GCHQ launches 'Puzzle Book' Challenge for Cryptographers
Cyber Matters: How To Solve The GCHQ Christmas 2015 Puzzle (Possibly?)
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Answers - The GCHQ Puzzle Book (2016)
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I spy ... another fiendishly difficult GCHQ puzzle book | GCHQ | The Guardian
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The GCHQ Puzzle Book: Perfect for anyone who likes a good headscratcher - Kindle edition by GCHQ. Religion & Spirituality Kindle eBooks @ Amazon.com.
The GCHQ Puzzle Book II: GCHQ: 9780241365434: Amazon.com: Books
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