That's just mahjong being gay as fuck because there's apparently like a dozen different variations based on the flavor of asian playing it (chinks, hong kong, japan, south korea, etc). I only understand this chink game because I played Yakuza 0. Think of it like a card game.
>4 sets of the character tiles that are labeled 1-9 in chinese characters (a tile with a red character with a blue character on top of it)
>4 sets of the bamboo tiles that are labeled 1-9 by number of bamboo sticks
>4 sets of the circle tiles that are labeled 1-9 by the number of circles
>4 sets of "Dragon tiles", that are red/green/white (red is a single red character, green is a single green character, and white is usually a square)
>4 sets of "Winds", that are North/South/East/West (tiles with a single blue character)
Your goal is to collect tiles to form combos (called "melds"). There are 3 types of combos
>Chow = 3 tiles of the same set in order (like a straight in poker)
>Pong = 3 identical tiles
>Kong = 4 identical tiles
You win by getting "mahjong", which is 4 of the 3 sets (chow/pong) OR 2 of the 3 sets (chow/pong)+1 of the 4 set (kong) and a pair of identical tiles. So your winning hand can look like something like:
>3 of the #4 bamboo tile, 3 red dragon tiles, the 6/7/8 circle tiles, and 3 of the #2 bamboo tile
>3 of the #4 bamboo tile, 3 red dragon tiles, the 6/7/8/9 circle tiles, and 2 of the #2 bamboo tile
The scoring system is a shitshow so I'm not even going to get into that shit, just know that chow < pong < kong for scoring. There's some extra tiles like Flowers and Seasons but that's not worth getting into. I hate this chink game and hate that it's burnt into my memory banks.