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Build working computers out of marble runs! Build a new digital logic circuit each week using the GraviTrax marble run system. source

One of four builds we’ll be making in this week’s GraviTrax Club Buy GraviTrax on Amazon: https://amzn.to/3xXIZNS (paid link) source

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I’m reviewing over 70 GraviTrax add-ons from 7 Etsy shops. In this episode, I review add-ons from ZummZumm. Add to your … source

A new GraviTrax trick you’ve never seen before! Launch marbles from the GraviTrax Spinner without touching it. The Spinner … source

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Here’s a small marble run in red, white, and blue marbles, for Veterans’ Day this week in the USA . Be sure to thank our … source

How long can we build a GraviTrax marble run? Could this be the longest GraviTrax marble run in the world? Does this marble … source