© 2014 IADIS. This paper treats serious games. Recently, one of the game genres called serious game has become popular, which has other purposes besides enjoyments like education, training and so on. Especially, learning games of the serious games seem very attractive for the age of video games so that the authors developed a mobile game for learning bacteriology as one of the achievements of their research project. In this paper, the authors introduce the game and show evaluated results about its learning effectiveness.