You’ve no doubt seen some version of this viral math problem making the rounds on Facebook, Reddit or X (though we’ve given ...

Fans of codebreaking, maths and brainteasers can now try their hand at the latest cryptic Christmas challenge set by GCHQ, ...

GCHQ has released their annual Christmas puzzle for 2025, even providing prospective codebreakers with some hints.

GCHQ's Christmas puzzle is nearly here but when will it be unveiled? Here's what we know so far about the upcoming quiz.

GCHQ has launched its annual Christmas challenge, featuring a new set of seven brainteasers and Christmas card designs by schoolchildren. This year's challenge marks a decade of GCHQ's festive puzzles ...

Can you solve GCHQ’s Christmas puzzle? - GCHQ has come up with a range of puzzles designed to test a range of problem-solving ...

They come as part of Christmas cards with three different designs, created by children in a competition with thousands of schools. If the puzzles look too impossible, there are hints available from ...

The UK's intelligence, security and cyber agency creates a Christmas Challenge puzzle every year and this year marks a decade ...