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GCHQ has released its annual Christmas challenge, with seven puzzles aimed to put the nation's codebreaking skills to the test.
Devised by in-house puzzlers at the UK's intelligence agency, the challenge is geared towards testing a range of skills to unlock a festive message. This year, for the first time, extra puzzles feature on the front of the card.
These were designed by three schoolchildren, after more than 500 children entered the agency's competition to hunt down the best budding spies. Some challenges involve codebreaking, maths and analysis, while others test skills including lateral thinking, ingenuity and perseverance - the same blend of skills GCHQ said are used every day to keep the country safe.
However "no one will find them easy.