The process of game development is contained of many steps that is hard to forecast success or failure. In order to develop successful game, the development period should be shorter, which could reduce development cost. In order to reduce development period and cost, it is needed to make a communication among planners, programmers, graphic designers and investors lively with a prototype as a communication tool. In this study, the concrete examples are demonstrated how to use prototypes as a tool for communication and feedback of team members, in the process of game development. This paper explains the characteristics of various types of prototypes according to types of game contents. This paper demonstrated two types of prototype according to development stage, one type is a prototype to gather feedback in the planning stage, the other is a prototype to make team members cooperate and communicate in the stage of production stage.