GCHQ Christmas card sets annual code-cracking challengeIt contains seven puzzles set by "GCHQ's in-house puzzlers", geared towards testing a range of problem-solving skills including intuitive reasoning and lateral thinking. GCHQ released its annual Christmas card on Wednesday , filled with puzzles and hidden codes designed to help children aged 11-18 hone a range of skills "they might need to become a spy". Fans of codebreaking, maths and brainteasers can now try their hand at the latest cryptic Christmas challenge set by GCHQ, the UK's intelligence agency. Students were asked to draw their response to the question: "What do you think GCHQ looks like on Christmas Day?". Answers were released on Wednesday evening - so you can see below whether you've got the puzzles correct.