Similar to the Marble Mazes, the Marble Tunnels use your fingers to guide the marble through the stitched tunnels. The Marble Tunnels have the added benefit of being able to see the 10 marbles included at the start and end to the tunnels (marbles are enclosed in the tunnels).  In doing so, people are working on their fine motor skills and improving the strength and dexterity of the small muscles of their hands and wrists, as well as being able to fidget with their hands without disrupting others around them.