GCHQ Christmas Card Challenge

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So the UK’s Government Communication HeadQuarters puts out a Christmas card for budding codebreakers. Apparently this is the toughest one yet. Aimed at schoolkids, but I ended up thrashing around a bit for a couple (one I ended up solving by working out what the solution should be and going backward to see how I was supposed to get it). So if anyone is interested in exercising some little grey cells…

I’ll add the card here to save some extra clicking.

gchq-card
gchq-card1812×5000 519 KB

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I think I solved a couple of those puzzles.

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My brain has a very hard red line between “fun puzzle” and “I ain’t got time for this nonsense”. The first two were on the fun puzzle side and the rest were over the line :grin:

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