The 2024 GCHQ Christmas Challenge is now live. Devised by Government Communications Headquarters, the British intelligence agency, this year’s puzzles encourage children aged 11-18 to think laterally and work as a team, testing skills including codebreaking, mathematics, and lateral thinking. “This year for the first time there are three additional elements hidden within the card for those who want to take on an extra challenge.”

The agency has included puzzles in its Christmas cards to global national security heads since 2015. Director Anne Keast-Butler said, “The puzzles are aimed at teenagers and young people, but everyone is encouraged to give them a try — they might surprise you.”