If you fancy yourself as a budding sleuth, hacker or code-breaker, GCHQ has released its annual Christmas challenge and is ...
Test your problem-solving skills with this challenging puzzle that only 10% of people manage to solve. Watch the full explanation and see if you can crack the code before the solution is revealed.
GCHQ has unveiled its annual Christmas Challenge for 2025, challenging Britons to try and crack the code. The festive puzzle ...