This is imo one of the best puzzles. It's clean, metal, symmetrical and yet super hard.
Hanayama Quartet.
Discussion
I’ve never seen this one. I love the precision.
If you have a lot of time and you don't know how to spend it, then I recommend it 😅
Oh boy, that is tricky, I have a neurospicy young kid sooo…, no time and lots of time at the same time, depends on the kid’s attention span more than anything. Anything that helps with dexterity, fine motor skills and spatial awareness is gold at present.
I gave one to my father. He was locked in his room for at least 5 hours before he showed up with the thing solved 😄