American Mahjong Rules, Explained in 10 Minutes

The fastest honest onboarding we can give you — enough to sit down at a table without embarrassing yourself.

Our experience writing up city scene reports in LA, NYC, and San Francisco made one thing clear: the overwhelming reason new players stall out isn’t “the tiles are confusing” — it’s that American mahjong feels like it runs on hidden logic. It doesn’t. It runs on exactly one thing you don’t start with: the NMJL card. Get that, get the game flow, and the rest clicks.

This guide gets you from “I’ve never played” to “I can hold my own in an NMJL game” without drowning in terminology.

The version you’re actually going to play

When a coworker in 2026 says “let’s play mahjong,” in most American cities they mean one thing: American mahjong as codified by the National Mah Jongg League (NMJL). Not Chinese mahjong. Not Japanese riichi. Not Hong Kong. American.

The difference matters because American mahjong:

Uses an annual NMJL hand card that defines the ~70 legal winning hands for the year
Includes 8 jokers (Chinese mahjong has zero)
Has a Charleston — a ritualized tile-passing opening sequence unique to the American game
Scores based on the specific NMJL card hand you win with, not Chinese fan/han multiplier stacks

If you learned the game from an app, a Chinese family member, or a documentary, you probably learned a different version. Both are mahjong. The rules here are specifically for NMJL American.

The set

A full American mahjong set has 152 tiles:

108 suit tiles (36 each of bams, cracks, dots)
16 winds (4 each of north/south/east/west)
12 dragons (4 green, 4 red, 4 white — “soaps”)
8 flowers
8 jokers

You also need: the annual NMJL card (issued every April, $14 on the NMJL site), racks, dice, and a way to keep score.

Game flow in one pass

Four players. One “East” (the dealer). The goal: be the first to build a 14-tile hand that matches one of the hands on the NMJL card.

The wall — 152 tiles are shuffled, then built into a 38-tile-long wall in front of each player, two tiles high. The wall is the draw pile.
The deal — each player gets 13 tiles. East gets 14 and discards first.
The Charleston — before play starts, players pass three tiles left, three across, three right, then three right, three across, three left. East decides whether the last pass happens.
Play — East discards. On your turn you draw a tile from the wall and discard one. You can interrupt play to claim a discarded tile if it completes an “exposure” that matches your target hand.
Winning — declare “Mahjong” when your 14 tiles match a hand on the card. You prove it by laying down the full hand.

That’s the whole loop. Draw, discard, occasionally grab someone else’s discard, aim at a card hand, win.

The NMJL card, demystified

The card is the entire game. Every year, NMJL publishes ~70 legal winning hands grouped into sections (Year hands, 2468, 13579, Consecutive Runs, Quints, Winds & Dragons, Singles & Pairs, etc.). Your job at the start of a hand: look at your 13 tiles, look at the card, and commit to a target.

Beginner mistake #1: picking a hand that needs 4+ tiles you’ve never seen. Fix: always have a first-choice and second-choice hand before the Charleston, so you can pivot if the first pass tells you to.

Beginner mistake #2: hoarding jokers without a plan. Jokers are powerful but they cannot be used for singles or pairs in Singles & Pairs hands. Know the restriction.

The 7 terms you need at the table

Call — taking a discarded tile that completes an exposure
Exposure — a pung (three matching tiles) or kong (four) laid face up after a call, locking in part of your target hand
Pung / Kong / Quint — three / four / five of a kind
Joker — wild card usable only in pungs, kongs, and quints (never singles or pairs)
Soap — the white dragon (it prints a blank-ish “○” image that looks like a bar of soap)
Bam / Crack / Dot — the three suits (bamboos / characters / circles)
Dead hand — a hand that can no longer win; you play out but can’t declare mahjong

What to do on your first night

Bring or buy the current year’s NMJL card. Do not try to play without it.
Tell the table it’s your first game. Every American mahjong group we’ve sat with in LA, NYC, and SF will walk a new player through the Charleston and first-hand target selection without complaint — it’s the culture of the game.
Skip mobile apps for the first month. The screen flattens the decision space and you learn nothing about reading a live table.
Play three full games before passing judgment. Round one is chaos. Round three is when the card starts making sense.

What’s next

Once the basic loop clicks, the skill curve is:

Weeks 1–2: reading the card fast, not getting lost in your rack
Weeks 3–6: defensive discarding (“don’t feed the table”)
Months 2–3: pivoting mid-hand when the wall goes cold
Month 3+: reading opponents’ exposures to infer their target hand

If you want the condensed version of this guide on a single printable page, our Beginner’s Mahjong Cheat Sheet ships free with a newsletter signup — every hand type, the Charleston sequence, and the joker rules on one card.

Sources: National Mah Jongg League official rules (nationalmahjonggleague.org); American Mah-Jongg Association card clarifications.