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Marble runs do not get much more complex or thrillingly immersive than the Marble Rollers City Builders. This is a multilayered and advanced marble run kit which allows children to construct lengthy tracks powered by nothing more than kinetics and magnetism. This allows children to get into STEM in an accessible and exhilarating manner. The detailed manual will not only allow children to build extensive tracks, but also provide them with a fun introduction to STEM.