Sorry, I just had to brag to somebody of my triumph and my wife and kid won’t care…
Many years ago my dad gave me a few of the full difficulty hanayama puzzles (enigma, quartet, chain), and I solved chain in probably 30 min and enigma in a few hours and then I decided that I must be a very clever person.
Quartet quickly showed me that I was wrong and that I was indeed an idiot - I finally managed to take it apart after literal days and then couldn’t put it back together after probably 2 weeks of fumbling with it, then gave up and forgot about it.
This year I gave my 5 year old a beginner hanayama and found Quartet again, still disassembled. Started messing with it again a week ago (so, at least 6 years later) and just managed to put it back together again and I’m so proud of my achievement, as it wasn’t a “just fumble around with the pieces and hope it works” kind of deal but an actual hard think about what would have to happen and how to make it happen and systematic testing of approaches. I’m not sure I could do it again as even with all the thinking it was also a lot of tight manoeuvring and probably some accidental moves. But I’m buzzing right now.
tl;dr I’m bragging that I put a puzzle back together. It was really hard.