Fig. 2

Game design. (There are 6 interfaces in the picture. Interface 1 is the login interface, including buttons of “start game”, “knowledge corner” and “point rankings”; Interface 2 is the battle process of the game; Interface 3 is a ranking of points; Interface 4 is the “Challenge to answer quizzes”; Interface 5 is the “knowledge corner”; Interface 6 is the data management system)