A game is a structured activity, usually undertaken for enjoyment, which is distinct from work. A serious game is developed with game technology for a primary purpose other than pure entertainment. The researches for game are executed in several science filed such as computer science, cognitive science, social science and etc. In this paper, we attempt to investigate the researches and theories for games to achieve the effectiveness of games. This paper gives a guide to serious game researchers and developer from a analysis of previous researches of video games.