Determining fun and entertainment as priorities of a educational game project was a little bit incoherent. However, this decision has its source in the well function perception of the entertainment games, which give its players amusement and entertainment, in an educational environment - it can be realized in RPG games and Chess, for example. This challenge resulted in a educational game - A Dama da Música - which is more effective than many other games with the same purpose. This fact confirmed the initial perception and reinforced a hypothesis about it, motivating the research that is developed in this paper. Based on the Gestalt structuralist view, defended by Max Wertheimer and Kurt Lewin, and according to Jean Piaget`s endorsement, an investigation about the cases where the use of entertainment games for pedagogical purposes produced results much better than the average produced by the games projected to this objective was started. Guided by the question: What the entertainment games have that the educational games do not have?, the research was developed through a detailed study of the games that have pedagogical purposes. An analysis of the project A Dama da Música was also developed in order to understand the method used on its project.