The aim of this thesis was to increase understanding of King company success in the social mobile game industry by asking the question: How does a company manage to organize the innovation work in successful casual games within social mobile gaming industry? In order to answer it, we conducted a case study research with secondary data in which we examined the company to discover the elements that contribute to this success, despite a lack of research in how these kind of companies build their business model and strategies, highlighting the players' behaviour. Our findings conclude it is possible to success in social mobile game industry using incremental innovation in different aspects: games design, implementation of the games, and in the business model.  By applying this innovation, with a good viral strategy and giving the player the decision to play by free or purchasing virtual goods, King has been able to become the largest developer game company on Facebook.