This weekend’s tip for the GraviTrax Spiral extension keeps the top of your spiral from coming off when the marble drops into it. source

This is part of my 21 minute GraviTrax marble run. I call it the Tower of Power! It includes 2 marble-activated spinners! source

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

Join Chris from The Masked Marble as he unboxes the GraviTrax Speed Starter Set! This marble run set that includes all kinds of … source

This GraviTrax marble track contains self-loading GraviTrax Balls & Spinners. Deze GraviTrax knikkerbaan bevat zelfladende … source

Marble run double loop Cobra roll for GraviTrax marble runs. It’s so satisfying and relaxing! source

This GraviTrax Marble cascade didn’t want to stop. source

What is in the GraviTrax Giant Starter Set? Full Contents Revealed!! It’s a virtual unboxing of the GraviTrax Giant Starter Set. source

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A track by Derek. Very cool. good job buddy. Forgive the camera. source