GCHQ has come up with a range of puzzles designed to test a range of problem-solving skills
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GCHQ has come up with a range of puzzles designed to test a range of problem-solving skills
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If you fancy yourself as a budding spy, GCHQ’s Christmas challenge will put your analytical skills to the test.
Do you have what it takes to crack GCHQ's Christmas codes? We have the questions - and the answers.
The winner will qualify for the GB team for the 2027 World Solving Championship, an event where they are often a medal contender
From corny adverts to snowy murder plots, test your knowledge with these seasonal questions
Nail the killers at the picnic and the library
Intelligence chiefs from MI5 and GCHQ are looking for young Russian speakers as part of a new recruitment drive in to work out…
Editorial: For nearly a century, the Guardian has been challenging and delighting its readers with these puzzles. Here’s to…
