Chinese authorities have said they may revise newly drafted online gaming rules shortly after the planned restrictions caused major tech companies to lose billions of dollars. State broadcaster CCTV reported on Saturday that the authorities have heard the "concerns and opinions raised by all parties", adding that "the State Press and Publication Administration will study them carefully and further revise and improve them", referring to the media regulator. The authorities released a draft on Friday with a wide range of rules and regulations aimed at curbing online spending and rewards in video games. Its impact was immediate, dealing a massive blow to the world's biggest games market. Investors went into a tailspin, leading to as much as $80bn in market value being wiped off from China's two biggest companies, industry leader Tencent Holdings and Netease.