THE POINT What you're actually trying to do
American Mahjong is a 4-player tile game built entirely around one thing: an official card of winning hands, published every year by the National Mah Jongg League (NMJL). Your only goal is to arrange your 14 tiles to match one exact hand printed on that year's card, then call out "Mahjong" before anyone else does.
That's the whole game. Everything else — the tiles, the Charleston, calling discards — exists to get you closer to a hand on the card.
THE SET What's in a 152-tile set
It looks like a lot, but it breaks down into a few simple groups:
Heads up: plenty of boutique sets throw in a few extra jokers or blank tiles beyond the standard 152 — totally normal, don't worry if your count doesn't match exactly.
SETUP Building the wall & the deal
- All 152 tiles are shuffled face-down, and each of the 4 players builds a wall 19 stacks long, two tiles high, pushed up against their rack.
- East (the dealer) rolls dice to decide where the wall breaks, then tiles are dealt counter-clockwise in blocks of 4 until everyone has 12.
- East takes 2 more tiles (ending with 14); everyone else takes 1 more (ending with 13).
THE CHARLESTON Trading tiles before play begins
Before anyone draws or discards, all 4 players go through a required tile-swapping ritual called the Charleston — it's what gets your rack closer to a real hand before the game even starts.
- Pass 1: everyone passes 3 unwanted tiles to the player on their right
- Pass 2: 3 tiles across the table
- Pass 3: 3 tiles to the player on their left
One rule that trips people up: you have to pass your 3 tiles before you're allowed to look at what you're receiving. If all 4 players agree, there's an optional second Charleston right after, run in reverse (left, across, right). Jokers can never be passed during the Charleston.
PLAYING A TURN Draw, call, or discard
Once the Charleston ends, play moves counter-clockwise starting with East. On your turn, you either:
- Draw the next tile off the wall, then discard something you don't need — saying the tile's name out loud as you drop it, so everyone hears it, or
- Call a tile someone else just discarded, out of turn, if it completes a set you need (more on this below).
Play keeps cycling this way until someone completes a full 14-tile hand from the card and calls "Mahjong" — ending the round.
CALLING Taking someone else's discard
If a discarded tile would complete a group you need (three, four, or five of a kind), you can call it out of turn — even if it's not your turn next. The catch: that set has to go face-up on your rack (it becomes "exposed," visible to everyone), and you immediately have to discard a tile of your own right after.
Calling is a trade-off: it speeds your hand up, but it also shows your opponents part of what you're building.
JOKERS The wild tiles
Jokers can stand in for almost any tile in an exposed group of 3 or more (a pung, kong, or quint) — but there are two firm exceptions worth knowing early:
- Jokers can never be used in a "Singles and Pairs" hand (a section of the card built entirely from lone tiles and pairs, no exposed sets)
- Jokers can't be passed during the Charleston
If someone is missing a tile you're using a Joker to represent, they can "swap" for it under specific card rules — that's a slightly more advanced move worth its own future post.
WINNING Declaring Mahjong
The moment your 14 tiles match one hand on the current year's card exactly — same numbers, same suit pattern, same tile groupings — you declare "Mahjong" and the round ends immediately. No partial credit, no close-enough: it has to match the printed line precisely.
Reading the actual card — what the colors mean, how a hand's "line" is written, what changes year to year — is its own topic. We'll cover that in a dedicated post soon.