GCHQ's Christmas card puzzle 'not yet solved' - BBC News
GCHQ Puzzles for Spies - Test Your Skills Against The Secret Agents Of - Present Indicative
GCHQ Christmas card: UK spy agency challenges 'wise men and women' to solve puzzle | CNN
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GCHQ: Nobody got crypto Christmas puzzle correct | WIRED UK
GCHQ releases answers to Christmas puzzle... which NOBODY was able to solve | London Evening Standard | Evening Standard
Fancy yourself as the next James Bond? UK spy agency GCHQ launches new codebreaker competition - Mirror Online
How to tackle GCHQ's Christmas card quiz | The Independent
Can you solve this Christmas brainteaser by UK spy chiefs? | UK News | Metro News
Can You Solve These Puzzles Set By GCHQ Experts?
I spy ... another fiendishly difficult GCHQ puzzle book | GCHQ | The Guardian
GCHQ Meta Puzzle (Puzzle Hunt)
GCHQ's Christmas card puzzle: Can you outsmart an 11-year-old?
Think you're a code-breaker? Try these GCHQ puzzles | ITV News
Director GCHQ's Christmas Puzzle 2015 - Part 1 - GCHQ.GOV.UK
Think you're a code-breaker? Try these GCHQ puzzles | ITV News
GCHQ and the IET present a new puzzle designed for STEM... - GCHQ.GOV.UK
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