COSAEL LOGIC Marble Run Building Blocks Cuboro Similar Product 3D Maze I purchased this new and, without using it, took it out of the box and stored it in a separate container. I discarded the box and lost one of the special marbles, so I marked the product condition as "slightly scratched or stained," but the blocks themselves are unused. [Product Contents] 56 blocks, 4 marbles, instruction manual [Product Condition] As shown in the photos, some blocks have brown or black knots, spots, slight scratches, or black dots inside the holes. These are original features and not added later. Regarding the black dots inside the holes, the shop's product description includes a photo showing them as part of the manufacturing process (photo 9). Please understand and accept the above product condition before purchasing. [Product Description] This is a product similar to Cuboro, which became famous due to Sota Fujii. Montessori COSAEL Logic