I've had this puzzle on my phone for years. Every few months I'd glance at it and try and solve it. Last night, as I was eating dinner, I finally figured out the answer!

https://sh.itjust.works/post/55641581

Figured it out. Weirdly, knowing you solved it made me confident I could too, and I don’t even know you 🤔

spoiler

I focused on the anomaly ignoring the rest, tried to see what possible rules could lead to it, then went back to see which rule also applied to the “non-anomalous” numbers. ___

This is exactly how George Bernard Dantzig proved two previously unproven statistical theorems, when he thought they were homework assignments.
The Unsolvable Math Problem

A student mistook examples of unsolved math problems for a homework assignment and solved them.

Snopes
Amazing story 💫
Once I saw a video about Mario Kart speedrunning history and there was a record on Rainbow Road that lasted for years. Than someone broke it but just told the community without showing how it was done. In a couple of days someone else figured it out and did it too. Sometimes we just need to know it is possible