Every year, GCHQ presents a Christmas challenge that tests the public’s skills in codebreaking, math, and lateral thinking. This year’s challenge involves decoding names of UK landmarks. Experts, including GCHQ director Anne Keast-Butler and puzzle authors, suggest working in teams and employing diverse skillsets to tackle the puzzles, which range from visual recognition to complex calculations. The aim is to foster problem-solving enjoyment without requiring specialized knowledge.