American, Japanese and Chinese mahjong share an ancestor and a set of tiles, and have almost nothing else in common. If you have played one and are learning another, this is the comparison you need — and if someone tells you one is "simpler" than another, this is the answer.
The short version
| American (NMJL) | Japanese (riichi) | Chinese (MCR) | |
|---|---|---|---|
| Tiles in play | 152 | 136 | 144 |
| Jokers | 8 | none | none |
| Flowers | 8, ordinary tiles | none | 8, bonus tiles |
| Winning condition | match a line on the annual card | any yaku | reach 8 points |
| Scoring | fixed value printed on the card | han and fu, calculated | 81 patterns, summed |
| Tile exchange | Charleston, mandatory | none | none |
| Player count | 4 | 4 (3-player variant exists) | 4 |
| Seasons | card changes every April | rules are stable | rules are stable |
What that means in practice
The tile sets are not interchangeable. A Chinese or Japanese set has no jokers and therefore cannot play the American game at all. An American set has 152 tiles and can play neither of the others without sorting out the extra sixteen.
The winning condition is the big one. In riichi you must build a recognised hand pattern, and in Chinese official rules you must reach an eight-point minimum. In the American game there is exactly one condition: your fourteen tiles must match a line printed on the current year's card. Nothing else counts, however pretty it looks.
This is the single reason the American game feels strange to players arriving from elsewhere, and the single reason it is easier for a beginner: there is no scoring to learn, because the card does it.
The Charleston has no equivalent anywhere. It is the only mandatory pre-play tile exchange in any widely played variant, and it is most of the reason the American game is a social one.
Which is hardest?
The question is mostly a waste of time, but the honest answer differs by stage.
Easiest to start: American. You can play competently on your first day, because the card does the arithmetic.
Hardest to start: Chinese. Before you can win you must know enough of eighty-one patterns to reach eight points, and the pattern names are in Chinese.
Hardest to master: a genuine toss-up between riichi and MCR. Riichi has a deeper competitive literature and a professional circuit. MCR has a wider scoring vocabulary and a minimum-win rule that punishes incomplete planning.
Most forgiving of a bad decision: American, by a distance. Being wrong costs one hand value from each player. In riichi, dealing into a big hand can end your session.
Can you mix them?
Not in the same hand, and attempts to do so are the most common source of arguments at mixed tables. The specific traps:
- Bringing riichi habits to the American game — building toward a yaku that is not on the card, or looking for dora that do not exist.
- Bringing American habits to riichi — expecting a tile exchange, or looking for jokers.
- Bringing Chinese habits to the American game — treating flowers as bonus tiles to be replaced. In the American game flowers are ordinary tiles that satisfy the "F" on the card, and there is no replacement draw.
Which should you learn?
If your friends play one, learn that one. The game is four people at a table and the rules matter less than the company.
If you are choosing for yourself: learn the American game if you want to be playing competently within a week and you enjoy a social table. Learn riichi if you want the deepest strategy literature in English and you like the idea of a game you can study for years. Learn the Chinese competition rules if you are interested in organised tournament play, because that is the ruleset most international competition uses.
A note on what "real" mahjong means
People will tell you the American game is a debased offshoot. The historical record is more interesting than that. The American game descends from the 1920s craze that followed Joseph Park Babcock's simplified rulebook, standardised in 1937 by the National Mah Jongg League — and Annelise Heinz's Mahjong: A Chinese Game and the Making of Modern American Culture (Oxford, 2021) makes a persuasive case that the American story is one of genuine cultural adaptation rather than dilution.
All three are real. They are simply three different answers to the same question, arrived at eighty years apart on three continents.