This is a set of 3 "Spot the Difference" books (from 2025). Please be sure to check the following: * There are some areas with writing. * There are stains and folds. * I have tried to confirm the number of answers, but there may be some missing. Please refrain from purchasing if you are concerned. [Areas with Writing] * Machigai Sagashi Mate May issue → 6 questions answered (There is a sticker on the top of the cover, see photo 2) * Machigai Sagashi Mate July issue → 17 questions answered * Machigai Sagashi Family → No writing * The application period for the prize has passed, so you cannot apply. How about using them for brain training?