Katsuno 15 Game ✪ Challenge to rearrange number tiles A slide puzzle that caused a boom in Europe and the United States in the 19th century. Let's complete it by arranging the numbers 1 to 15 in order. Target age: 6-100 years old Develops problem-solving skills and inductive reasoning. The box has some discoloration and dents, but the main body is in relatively good condition.