The Free-to-play (F2P) model is the primary business model applied in indie mobile games nowadays. However, the fact that less than 5% of players are paying is still a big problem for developers. There is a theoretical gap in understandings of how to increase revenue without lowering the quality of the game and deliver more valuable and better gaming experience for players. Some assumptions and empirical methods need to be verified. The aim of this research is to understand a series of specific design and development questions of F2P games, including game inner mechanics, game structures, and monetization strategies. We attempted to find consensus between developers and players. In addition, this research also sought to find out how F2P mobile game can provide as a comprehensive service in order. It sought to find a sustainable and profitable business model for each game by integrating monetization organically inside of the game without sacrificing players’ enjoyment. We used a mixed methods research approach, including both interviews and surveys, to examine the opinions and behavior of developers and players based on the Acquisition-Retention-Monetization funnel.