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I would love a game where you learn to actually read QR codes by eyesight - and quickly. Would be quite fun to have an impressive and not very useful skill

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Not sure if it's possible to be honest, it might be if you can sit down with a pen a paper. But again we've seen human perform seemingly impossible tasks before, so who knows.

I've always wanted to see someone encode/decode Base64 in their head.

At best, I've learned to recognize a base64 string that begins with "eyJ" is likely JSON.

Also, if you asked me what the base64 encoding of "password" is, but if you showed me "cGFzc3dvcmQ=" and asked me what the decoded value is, I'd recognize it as "password". Though you could probably change a few digits and fool me.

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