Questionnaire is a necessary method for investigation and research, but it often scares participants because of the impression of being long and boring. We developed a game-like questionnaire as an effective method to collect information and ideas from participants. In this paper, we describe the use of this tool to facilitate a photovoltaic (PV) application research, which is led by the University of Southern Denmark. The research is collaboration between local companies to popularize PV technology in both residential and the industrial markets. For such an innovative research, the interactive questionnaire developed by means of participatory design has helped us get a balanced perspective between user needs, market viability, and technical feasibility. Moreover, this tool guided our research focus on the artistic and usability aspects, and also raised design concepts and the concern of practice issues.