Marble Computer Teaches Programming
erco
Posts: 20,257
I'm mad I didn't invent this mechanical marvel! Appears to be well thought out, comes with comic book lessons/challenges.
https://newatlas.com/children/turing-tumble-review-marble-computer
Although it's possibly just a reskinned 1965 Digicomp 2: https://en.wikipedia.org/wiki/Digi-Comp_II