There are three books and each of it has numbers on it. Look for the number which is not seen to the other, there's one for every book. Find those number before the time runs out. number matching game, kids math games, educational games for kids, number recognition, number skills, math skills, early numeracy, problem solving, fun learning, educational activities, arcade games, kids activities, number puzzles, math practice, skill building, educational, education, children's games