The directions, North, South, East, West count as a set: click North and East and the pair disappears. Some games have Middle, some don't.
The symbol for Middle is a horizontal rectangle with a single vertical stroke going through its center.
Another set is Fruit: Pear, Plum and two others. Another set is Seasons: Summer, Winter, Spring & Fall. Same rule applies: match two of a Set and the pair is counted.
The compass directions are marked in English on the upper left: N, S, W, E.
There are numbered suites, like our playing cards, 1-9; the numbers are also in English on the upper left. Match the 2's (form example) of a like pictograph and the pair is counted and disappears.
I have played Mahjongg on an automated mechanical gambling machine in a small casino in Shanghai. It is different, goes fast and is fascinating to watch. The tiles turn themselves over and shuffle also; I was dying to get inside that machine, but that wasn't going to happen
Mustang