Gravitrax.trek.pub
Build working computers out of marble runs! Build a new digital logic circuit each week using the GraviTrax marble run system.
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ROKR Spaceport Marble Run (Upbeat Tune)
Help me make more videos! Shop my affiliate links: ▻ GraviTrax Junior sets: https://amzn.to/4d0EkgJ ▻ …
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