GCHQ brain-teasing puzzle used to test spies is released to the public, but can you solve it? - Edinburgh Live
GCHQ Christmas card: UK spy agency challenges 'wise men and women' to solve puzzle | CNN
Here's who came closest to solving GCHQ's 'fiendishly difficult' Christmas puzzle | The Independent | The Independent
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GCHQ: Nobody got crypto Christmas puzzle correct | WIRED UK
Can you solve this Christmas brainteaser by UK spy chiefs? | UK News | Metro News
Fancy yourself as the next James Bond? UK spy agency GCHQ launches new codebreaker competition - Mirror Online
GCHQ Christmas Puzzle — alaricstephen.com
Stay busy with our brainteasers - GCHQ.GOV.UK
Think you're a code-breaker? Try these GCHQ puzzles | ITV News
GCHQ Puzzle Book II | The Present Finder
GCHQ Meta Puzzle (Puzzle Hunt)
Think you're a code-breaker? Try these GCHQ puzzles | ITV News
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GCHQ publishes book of spies' brainteasers for children | GCHQ | The Guardian
GCHQ's Christmas card puzzle: Can you outsmart an 11-year-old?
I spy ... another fiendishly difficult GCHQ puzzle book | GCHQ | The Guardian
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GCHQ Puzzle Book II | The Present Finder
![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
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UK's GCHQ reveals festive puzzle for young wannabe spies
GCHQ releases answers to Christmas puzzle... which NOBODY was able to solve | London Evening Standard | Evening Standard
The GCHQ Puzzle Book
