Purchased in the summer of 2025. No writing inside, as it was copied for use. The cover of volume 13 has a peeled area where a sticker was attached. Set of 7 books. Used as an application of the material covered in the cram school textbooks. - Series Name: Pygmalion - Author: Yasuo Ito - Problem Book Number: 6 Space and Position - Problem Book Number: 10 Spatial Recognition - Problem Book Number: 11 Block Problems - Problem Book Number: 12 Number of Blocks ① - Problem Book Number: 13 Number of Blocks ② - Problem Book Number: 24 Quantity and Weight - Problem Book Number: 17 Origami Expansion - Content: Cultivating thinking and creativity - Publisher: PYGMALION - Price: 770 yen per book