In this study, we design a digital game to support students in learning knowledge of the law. Nowadays, there are many serious accidents that are caused by violation of traffic regulations, in which these accidents may lead to irreversible regret for ever. More importantly, those people who encounter accidents are incapable of protecting their own interests, because they do not really understand the knowledge of the law. Accordingly, we design a mobile digital game to support students who will be a member of society soon after to learn the knowledge of the law in order to prevent the regret.