Math puzzle book to cultivate thinking skills. - Title: Tetsuwan Nazo-P - Target age: 4th to 6th grade elementary school students - Publisher: Soshisha - Price: 1300 yen (excluding tax) Thank you for looking. I spilled tea on it, and there is a stain on the upper right corner of the book, but I used to copy the pages, so there are no markings inside. It contains quite a few difficult problems. I was working on it, hoping to develop thinking skills for the purpose of preparing for junior high school entrance exams. I passed my desired school, so I am decluttering.