The9 Limited, headquartered in Shanghai, is engaged in online game publishing, cryptocurrency mining, and investments in artificial intelligence (AI). Initially concentrating on the gaming industry, the company has since expanded its scope to include cutting-edge technologies. It has both developed and operated a range of online games such as Legend of Immortals, The World of Kings, and CrossFire. In addition, The9 has entered the field of cryptocurrency mining by contributing computing power to Bitcoin mining pools in return for partial Bitcoin earnings.