I received this about six months ago, but it seems like they weren't interested, and it's been stored on the shelf ever since. Although it's unused, I opened the contents this time for the photos. Please purchase only if you understand that this is a used item. Also, the outer box has damage and scratches as shown in the images, so please refrain from purchasing if you are sensitive to such things. I'm offering it at the lowest price I can, but I'm open to lowering the price if someone else is selling a similar product for less! [Elementary School Pythagoras®] From 2D to 3D. Pythagoras cultivates spatial reasoning skills. Pythagoras was created from educational materials that math teachers used to teach figures and solids in an easy-to-understand way. By repeatedly building and breaking things down, you'll naturally develop an understanding of how to create 3D shapes from 2D ones. Includes a step-up "New Curriculum Guidelines-compliant drill" in cooperation with the Japan Mathematics Certification Foundation. You can use Pythagoras to create and understand "congruence" and "polygons and prisms," which appear in upper-grade classes. Target age: 6 years and older Quoted from the internet