In this paper, we describe our activities on student competitions conducted by connecting multiple universities online. By combining online lectures, tutorials, and various types of groupwork, undergraduate student participants from 11 universities worked together to propose their original ideas in a short period of time. The results were evaluated by faculty members from 16 universities and institutes based on objective criteria. Mixing the students and instructors of various backgrounds promoted open communication and formation of human network among them. Quantitative analysis of various indices elucidated the educational effect of the competition.