Every year, GCHQ also publishes a special festive challenge for 11 to 18-year-olds. It comprises a downloadable PDF with brainteasers and puzzles, designed by the GCHQ crew, and is typically worked on in schools. The puzzles are not designed to be solved alone and therefore encourage children not only to think laterally, but also as a team.

One of the UK's spy agencies has released a befuddling puzzle to put Britons through their paces as it looks to get more people into intelligence and cybersecurity. The Government Communications Headquarters,

The UK's intelligence agency has released its annual Christmas puzzle - do you have the brains to take on the challenge?

GCHQ has revealed its annual Christmas puzzle, which this year contains hidden clues for those who want an extra challenge.

This year, three extra clues, known as Easter eggs, will be hidden among the seven challenges, each of which will lead the puzzlers to a UK landmark. GCHQ’s chief puzzler, Colin, has also hidden a secret message in the following quote.