The annual puzzle challenges the public to decode the names of UK landmarks using everything from lateral thinking to codebreaking.

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.

GCHQ has run its Christmas puzzle challenge for nearly a decade, but the latest card from the agency - which has multiple sites across the UK - will mark a first

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,

Latin dancing, Indian butter and American soldiers are some of the clues for this year's cryptic Christmas challenge set by the national spy agency. GCHQ's annual brainteaser comes in the form of the agency's Christmas card,

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.

Every year, the government’s secret communication service sets a festive puzzle for the British public to set their minds to and decipher. Whether you’re looking to test yourself or inspire a budding young mind to pursue a tricky career in cybersecurity or intelligence in the future,