“Strong Education Puzzle 5: Addition Puzzle A - Intermediate Edition” Tetsuya Miyamoto Price: ¥1000 #TetsuyaMiyamoto #Tetsuya_Miyamoto #Book #Nature/Mathematics There is a little bit of dirt (?), as shown in the fourth photo, but there are no creases, and it is unused. Although it's for elementary school students, I was working on it at school as a brain exercise.