It has been well established that introducing game elements to education may engage young learners in an active learning process while achieving decent learning results. However, few previous educational game design models emphasize the balance between education and entertainment. More importantly, few of them are sustainably compatible with formal education. To meet these goals, we proposed a game design method and developed a sample game to help and improve lower grade-level students’ math learning. Empirical study was conducted to evaluate the effectiveness of the proposed method and students’ game-based learning performance.