Kodomo Challenge Step Design It Yourself Slider Go Go An educational toy that you assemble with colorful parts. (With a how-to-play book) You can freely change the course by combining the blocks, and you can play while having fun and thinking. I only played with it once, but the booklet has a used feel because it is a used item that my child played with. Thank you for your understanding. I am also selling other Kodomo Challenge products.