Shares of Tencent Holdings Ltd dropped more than 2 percent on Tuesday after China announced new rules for young video gamers.

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That compared to a 0.4 percent slide in the benchmark Hang Seng Index and a 0.6 percent gain in Hang Seng Tech Index.

China announced on Monday rules forbidding under-18s from playing video games for more than three hours a week, a stringent social intervention that it said was needed to pull the plug on a growing addiction to what it once described as "spiritual opium".