[quietplatypus]

Fidget spinners are genuinely useful though---arguably even more useful than the other items on the list, for their ADHD/anxiety-reducing properties plus portability.

The only way you can do noticeably better is direct, hands-free brain stimulation. The fidget cube is also such an object, but it is MUCH more complex and hence vulnerable to be put down due to a competing distraction.

[Neeek]

Wait, I thought the cube was just a bunch of interesting things to fiddle with, there's no problem solving element to it is there? And when I say interesting, I really just mean different switches with a satisfying tactile response. I fail to see how it's any more complicated to operate...