Thousands worldwide, from San Francisco to Slovenia, are counting down to Christmas with a puzzle-a-day programming challenge called Advent of Code. By midnight on December 1, 2015, when Eric Wastl ...

Do you have what it takes to crack GCHQ's Christmas codes?

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

For many, the world of computer coding can seem quite daunting. However, code is just like any other language, with its own grammar, syntax, and all the hallmarks of a regular written language. With ...

GCHQ has unveiled its annual Christmas Challenge for 2025, challenging Britons to try and crack the code. The festive puzzle contains seven difficult brainteasers to solve, testing a variety of ...