They are experts at espionage and subterfuge but now spooks at GCHQ have released their annual Christmas brainteaser – to test even the nation’s brainiest kids.
More than a thousand secondary schools signed up to the test, which assesses 11-18 year olds’ code-breaking skills.
The Government Communications Headquarters (GCHQ) challenge will have children scratching their heads as they test their mathematical and analytical skills in seven questions which get progressively harder.
Express.co.uk has reproduced the questions in this article. Each question in this article will be made clear by the caption underneath the pictures.
Adults can even have a crack at the challenge.
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