Only seen it in Japan, also didn't have an idea what I was doing but it was fun.
There may have been some children ones, obviously not as good, you could see them in Taiwan, but not the real thing.
Gambling is really big over here, all Chinese are prone to gambling addiction.
Gambling is also illegal in China and HK.
That doesn't stop them having Mahjong houses, and Gov allowed betting shops, a race course in Happey Valley and Casinos in Macao.
Of course they are all addicted to their phones now.