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The GCHQ Puzzle Book
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GCHQ Meta Puzzle (Puzzle Hunt)
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GCHQ's Christmas card puzzle: Can you outsmart an 11-year-old?
:quality(70)/cloudfront-eu-central-1.images.arcpublishing.com/thenational/MTXTK7IWYRFB5JDS46DC7PFFZQ "UK's GCHQ reveals festive puzzle for young wannabe spies")
UK's GCHQ reveals festive puzzle for young wannabe spies
Can You Solve These Puzzles Set By GCHQ Experts?
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How to crack British intelligence service's devilish Christmas puzzle
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GCHQ Christmas card includes tricky puzzle.
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The GCHQ Puzzle Book II: 2
Think you're a code-breaker? Try these GCHQ puzzles | ITV News
