Tokyo-based Mixi announced today that it has partnered with Chinese internet giant Tencent to bring its popular Monster Strike game to mainland China, Hong Kong, and Macao. Mixi’s Monster Strike is an RPG for iOS and Android, and since its launch last October, the title has acquired over three million users. Our readers may recall its rapid growth has helped the company return to profit, with Mixi’s game department general manager Hiroki Morita moving up to take on the CEO role. Coinciding with the Tencent partnership, Mixi will start an aggressive promotion of Monster Strike in Japan tomorrow, including a new TV commercial (see below) broadcast on many networks.