Most of communities in Hong Kong are lack of strong connection between District Councillors, residents, and the community. Our research and observations show that young people nowadays actually do care about their community and are willing to contribute if there is a comfortable way. Hence, we hope to provide a gamified mobile platform that can enable residents, district councilors, and the community to build a stronger connection.‘Cobuild’ provides an interesting way for residents to express their opinions and participate in contributing comfortably and effortlessly. They can begin to rebuild their own unique community with the help of the district councilor by using this application.