Shinkenzemi Elementary School Course 1st Grade "3-Month Completion: Review Perfect Machine" There are 24 cards. No batteries or anything are needed. Insert the cards from the top, and when you pull one of the three-color buttons as shown in the photo, a ⭕️ or ❌ hidden by the red sheet will appear (see photos 3, 4, and 5). The cards have problems on both sides, and you can work on Japanese language, math, science, general knowledge quizzes, etc., which is fun. After you finish the last card and advance the cards with the orange button, Korasho will pop out from the bottom and praise you! (Last photo) My child worked on it together and found it so fun that they solved all the problems at once, so it was only used once and then kept at home.