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?
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 ...
Some results have been hidden because they may be inaccessible to you
Show inaccessible results
Feedback