Not many reviews and they seem complete. But I had to listen to another person say it just doesn't work. You're right. Out of the box, even with the recommended settings, it just doesn't work. It sends the marble in a random direction, sometimes where you want it, most often right next to the track. I teach potential energy and kinetic energy, not chaos theory. It should at least work most of the time. But that's not the case.
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