GCHQ, the UK’s intelligence agency, released its annual Christmas card on Wednesday, filled with puzzles and hidden codes. The spy agency's "Chief Puzzler", known as "Colin", said the notoriously ...

This is the full card, which you'll need in order to solve the puzzle. If you love testing your mind, then it’s the perfect time of year - the annual GCHQ Christmas quiz and the answers have been ...

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. GCHQ released its annual Christmas card on ...

Add Yahoo as a preferred source to see more of our stories on Google. The card was created by both school children and spies (GCHQ) GCHQ, the UK’s intelligence agency, released its annual Christmas ...

Add Yahoo as a preferred source to see more of our stories on Google. This is the full card, which you'll need in order to solve the puzzle. If you love testing your mind, then it’s the perfect time ...