Wirelessly posted (iPhone 4: Mozilla/5.0 (iPhone; CPU iPhone OS 5_1_1 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1 Mobile/9B206 Safari/7534.48.3)
There are some card game shop in MongKok area (inside sino shopping center) and some "upstairs store", I.e. shops in office building to do that (which also provide space for frequent visitor to play)
Was there once or twice only so you probably need to google a bit more.