Mine would be creating pen and paper ciphers for my made up secret communication needs.

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[โ€“] 21 points 3 years ago

I do the same! And you know, I think this is a hobby by itself. It's also very useful when talking with strangers if they tell you they practice one of the hobbies you've binged on. You can ask them more pointed, interesting questions and it makes for great conversations!

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