GraviTrax marble run on a wall – pretty cool!
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REVIEW: GraviTrax Junior / My Planet Starter Set – Marble Run for Ages 3-7
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GraviTrax marble run on a wall – pretty cool!
source
This video review of GraviTrax Junior is loaded with Goodies & Freebies! Support my videos …
used zipline expansion for the rails
Crazy ideaπ€―