The vertical target presented in the game requires precise rules and, in doing so, limits the play forms and the liberty of one’s will. This is one of the characteristics that distinguish it from others, but it is also a stumbling block in trying to include the advantages found in other contents. As a new game development strategy for this problem, if one can effectively combine fun and advantages of community into a game play environment through a virtual world, it will be another attractive, strong point for the games.
