Purchased in October 2025. All answers are filled in. I'm selling this because I think it's a very interesting and good set of problems. Would you like to try it out or use it as a reference for creating problems? "Genius!! Time-Killing Drill: Slightly Difficult - Develops Math and Japanese Skills" Toru Tanabe / Kanae Izumi Price: 1320 yen #ToruTanabe #Toru_Tanabe #KanaeIzumi #Kanae_Izumi #book #society/education_learning