Mine was 4-5 yo when he first saw it, and got it very quickly. Some people are just wired for this sort of puzzle I think. He also loves Gravity Maze: https://

Mine was 4-5 yo when he first saw it, and got it very quickly. Some people are just wired for this sort of puzzle I think. He also loves Gravity Maze: https://www.thinkfun.com/products/gravity-maze/ https://www.thinkfun.com/products/gravity-maze/