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GCHQ brain-teasing puzzle used to test spies is released to the public, but can you solve it? - Edinburgh Live
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GCHQ Christmas card: UK spy agency challenges 'wise men and women' to solve puzzle | CNN
Think you're a code-breaker? Try these GCHQ puzzles | ITV News
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GCHQ's Christmas card puzzle 'not yet solved' - BBC News
I spy ... another fiendishly difficult GCHQ puzzle book | GCHQ | The Guardian
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GCHQ's Christmas card puzzle: Can you outsmart an 11-year-old?
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GCHQ Christmas card includes tricky puzzle.
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![The GCHQ Puzzle Book [Review] – Lock Me If You Can](https://lockmeifyoucan.files.wordpress.com/2017/01/img_9310.jpg?w=863 "The GCHQ Puzzle Book [Review] – Lock Me If You Can")
The GCHQ Puzzle Book [Review] – Lock Me If You Can
Here's who came closest to solving GCHQ's 'fiendishly difficult' Christmas puzzle | The Independent | The Independent
