A game, "Who's who" has been developed to be used in science and technology courses and in physics, chemistry and biology courses. The game is about acids. The purpose is to teach chemical danger symbols and meaning of some acids. Since the game improves the students' cognitive development and interaction among them, it will provide the children with an effective learning process. Through the game, students will have opportunity to learn the chemicals that they will use in laboratories repeating the related information whenever they wish and to reinforce their knowledge. "Students will learn through playing and will be saved through learning."