I'm missing the balls, and I don't have any. I've been using marbles as substitutes. The assembly instructions are torn. There is no major damage to the main unit. Instant purchase without comments or messages is welcome. Thank you. Slope Toy Educational Toy PythagoraSwitch Ball Rolling, Building Blocks, Wooden Toys, Birthday The Tricky Tracks series is a fun set where you can't predict which rail the ball will go on. "Tricky Tracks" allows children to learn "cause and effect" from the movement of the ball "rolling and falling," stimulating their creativity and curiosity. Also, you can combine each unit to freely challenge "rail building." The speed of the ball and the sound of it falling change depending on the curves and the height of the rails. Can the ball reach the goal? Through trial and error and ingenuity, spontaneity, spatial awareness, and the ability to construct stories are naturally nurtured. Toys from Wonderworld that nurture children's imagination and creativity. This wooden toy brand, with a wide selection for babies to kids, has been loved worldwide, including in Europe, America, and Japan, for over 15 years for its colorful colors and unique forms.