Closed-minded from the start, Tencent has completely changed its way of working, realizing the benefit of being an open source platform and seeking open source funding. Operationally, Tencent works completely differently from just three years ago. Why did Tencent take down barriers to sharing and choose the open road? How does Tencent’s open platform work? How to build a platform ecosystem? What are the risks of shifting from PC to mobile? What vision does Tencent have for the future of mobile platforms? This case aims to bring clarity to these issues.