GCHQ: Nobody got crypto Christmas puzzle correct | WIRED UK
GCHQ and the IET present a new puzzle designed for STEM... - GCHQ.GOV.UK
How to tackle GCHQ's Christmas card quiz | The Independent
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Can you solve this Christmas brainteaser by UK spy chiefs? | UK News | Metro News
GCHQ Puzzle Book II | The Present Finder
GCHQ Release Cryptic Christmas Card Puzzle
GCHQ's Christmas card puzzle 'not yet solved' - BBC News
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GCHQ Christmas Puzzle — alaricstephen.com
Director GCHQ's Christmas Puzzle 2015 - Part 1 - GCHQ.GOV.UK
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UK's GCHQ reveals festive puzzle for young wannabe spies
GCHQ brain-teasing puzzle used to test spies is released to the public, but can you solve it? - Edinburgh Live
Think you're a code-breaker? Try these GCHQ puzzles | ITV News
The GCHQ Puzzle Book
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Stay busy with our brainteasers - GCHQ.GOV.UK
The GCHQ Puzzle Book II - Penguin Books Australia
GCHQ releases answers to Christmas puzzle... which NOBODY was able to solve | London Evening Standard | Evening Standard
Can You Solve These Puzzles Set By GCHQ Experts?
