For the past few years (with some gaps) GCHQ have released a very special card at Christmas. Not just a device for wishing recipients the best of the season, it includes puzzles to solve! These are usually presented as a series of brainteasers of increasing difficulty, with the early stages usually pretty accessible, and the later ones a bit more challenging.
Here are links to each one so far, with a preview of each:
2021
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| GCHQ's 2021 Christmas Card - Preview |
2020
2019
Links: GCHQ Blog Post | Card (.pdf) | Solutions: A B C
2015
This Christmas Puzzle was released as a public competition with the solution to the first stage providing a link to the second stage, and so on. To complete it authentically you will need to start with Par 1 and continue from there, but links to all of the parts and their solutions are provided below the preview.
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| GCHQ's 2015 Christmas Card: Part 1 - Preview |
I think this is all of them. Have I missed any? Let me know.
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