Ubiquitous games research group explores the emerging field of games based on sensing technology. Recent sensor-based games not only enable the gamers to play games with natural interactions such as gestures, but also make the game development much harder. Our goal is to provide development tools for ubiquitous games and make it easier to develop such games. We design and implement Player Space Director(PSD), a platform for ubiquitous games and sample games which are developed and executed on PSD.