I play Mahjong. If I try talking to most Americans about it, they'll think I'm talking about Shanghai, or Mahjong Solitaire.

I actually play 3 forms of it:

Riichi: Standard Japanese rules. This is what you typically see in anime and mahjong games from Japan.

CSM: Competition rules for Chinese Mahjong. This what you'll typically see played in tournaments outside of Japan

American Mah-jongg: A ruleset with a lot of unique features. An AMJ set contains jokers that can act as any tile in the set. The game is played without being able to call "chow"(taking a sequence of 3 pieces), You "Charleston" for the pieces you need before the round begins (pass pieces to the right, left, and across from you), and the standard hands you can make change on a yearly basis. This is the version you often see played by the American Jewish community.

I love playing all three, but it's hard to play them in person, because you need to find at least 4 people who can play by the same rule set.

Riichi is easy enough in Japan, but it's seen as kinda a sketchy game here, and most places you can play it are at expensive and seedy mahjong parlors. Luckily there are a flood of video games based around it that make it more accessible.

Chinese Mahjong is very regional, and each area can have its own variation on the rules, scoring, accepted hands etc. When playing with Chinese friends, I just kinda roll with whatever variation they're playing.

For American Mah-jongg, because the standard hands change year to year, you have to buy a new card from the National Mah Jongg League yearly in order to keep up with it, so it's the only mahjong game with a subscription cost built in. Also as mentioned, the game is very community specific, but also the majority of players are often senior aged women, usually making me the youngest at the table by far.

I love playing all three, but it's hard enough finding someone else who also likes Mahjong, let alone find someone who doesn't confuse it for the solitaire game. I'm not saying Mahjong solitaire ruined my life, but if I could Thanos snap a game out of existence...