Jokers in American mahjong can stand in for any tile, but only inside a group of three or more matching tiles. The 152-tile set contains eight jokers, and nothing else at the table is as adaptable. That flexibility has firm limits, though, and nearly every new player trips over one of them. This guide shows exactly where jokers can go, where they can never go, how a joker exchange works, and how to avoid the most common beginner errors.
Key takeaways
- A joker can substitute for any tile, but only in a group of three or more: a pung, kong, quint or sextet.
- A joker can never be used in a pair, and can never stand alone as a single.
- Jokers cannot be passed in the Charleston or the courtesy pass, and a discarded joker can never be called, not even for Mahjong.
- In a joker exchange, you swap the real tile for a joker in an exposed set, on your own turn.
- Using a joker in a pair or single and then declaring Mahjong makes your hand dead.
What a joker can do
A standard American set has eight jokers among its 152 tiles. A joker may substitute for any tile, provided it sits in a group of three or more matching tiles. Those groups have names:
- a pung is a group of three identical tiles;
- a kong is a group of four;
- a quint is a group of five;
- a sextet is a group of six.
A group can hold more than one joker, as long as the group stays legal under the line of the card you are following. Imagine a made-up pung made of two real eight-of-bams tiles and one joker standing in for the third. Whether a particular line allows a joker in a given group depends on the card, so always check the card, because the card is the final word on what a legal group looks like. Some card lines allow no jokers at all, so read the line before you count jokers into it.
To understand how this connects to the whole hand, read where jokers fit in a hand: count the groups. It shows how to look at a line and see which groups could take a joker.
What a joker can never do
- Never in a pair. Where the card asks for a pair, you need two real tiles.
- Never as a single. A tile that stands alone in a hand cannot be a joker.
- Never passed. Jokers cannot be passed in the Charleston or in the courtesy pass.
- Never called once discarded. If a player discards a joker, nobody can take it, not even to win.
If you declare Mahjong with a joker standing in a pair or a single, the declaration is wrong and your hand is dead. That means you can no longer win or call a discard, and most groups also stop a dead hand from exchanging jokers. Check your hand before you speak.
Do not confuse jokers with flowers: flowers can be passed in the Charleston, while jokers cannot.
The joker exchange, step by step
A joker sitting in an exposed set is not safe. If you hold the real tile that the joker is standing for, you can swap it in and take the joker for yourself. Here is how it goes:
- Wait for your own turn. Exchanges are made on your own turn, after you draw (or call a discard) and before you discard.
- Find a matching exposed set. It can belong to any player at the table, including you.
- Check you hold the natural tile. It must be the exact tile that the joker is replacing.
- Swap. Place your real tile into the set, and pick up the joker.
- Carry on. You may make several exchanges in one turn, then you discard as normal.
The joker you collect is now yours to use in a group of three or more, or to keep for a later set. It can help your hand directly, so a well-timed exchange can be a big turning point.
Remember that timing matters at the table, too. A player who wants to call a discard needs to speak up before the next player starts a joker exchange. The details are in calling a discard.
A worked example
Imagine a made-up situation. Priya has called a discard and laid down a set of three on her rack: two real three-of-craks tiles and one joker. Everyone can see it.
Later, you draw a three of craks. You look at the exposed set and notice that the joker is standing in for exactly that tile. You still have your turn to finish. You place your three of craks into Priya's set, take the joker, and tuck it into your hand. Priya's set is still legal, because it now has three real tiles.
You are now free to use the joker in one of your own groups of three or more. Then you discard one tile, and your tile count is back to 13. What made this possible was a single matching tile on your own turn.
Now imagine a mistake. You hold a pair on your rack and use a joker as the second tile of that pair. You then declare Mahjong. The table checks the hand, notices the joker is in a pair, and your hand is dead. The lesson: when the card asks for a pair, use two real tiles.
Risk and reward of exposing jokers
Jokers make hands easier to complete. But the exchange rule makes jokers in exposed sets a risk. When you expose a set with a joker in it, you have shown the table three tiles and you have also put a joker on display for anyone who holds the matching natural tile.
That does not mean you should never expose a joker. Sometimes the set is exactly what your hand needs, and the risk is worth it. As a rule of thumb, ask how many copies of the natural tile could still be out there; there are only four of each number tile. For a related point about the set itself, see why all eight jokers should match.
Common mistakes
- Using a joker in a pair. Pairs need real tiles.
- Using a joker as a single. A lone tile cannot be a joker.
- Trying to pass a joker. It is not allowed in any part of the Charleston.
- Trying to call a discarded joker. It can never be called.
- Exchanging on someone else's turn. Exchanges happen only on your own turn.
- Swapping the wrong tile. The tile you put in must be the exact natural tile the joker stands for.
- Forgetting the card. Even where jokers are allowed, the line of the card must still allow the group.
Quick reference
| Situation | Joker allowed? |
|---|---|
| Pung, kong, quint or sextet | Yes |
| Pair | No |
| Single tile | No |
| Passing in the Charleston or courtesy pass | No |
| Calling a discarded joker | No, not even to win |
| Exchange with a natural tile | Yes, on your own turn |
Try it at your next game
Before you start, ask each player to point out on a sample hand exactly where a joker may go and where it may not. Then, during play, say aloud "joker in a set of three or more" whenever you use one. It is a quick habit that prevents the most common dead hands.
Frequently asked questions
Can a joker be used in a pair?
No. Jokers can only be used in groups of three or more matching tiles. A pair needs two real tiles.
Can you use a joker as a single tile?
No. A tile standing alone in a hand cannot be a joker.
Can you pass a joker in the Charleston?
No. Jokers can never be passed in the Charleston or the courtesy pass.
Can you call a joker that was discarded?
No. A discarded joker can never be called, not even to complete Mahjong.
How does a joker exchange work?
On your own turn, if you hold the natural tile that an exposed joker stands for, you can swap it in and take the joker. It works on any exposed set, including your own, and you may make several exchanges in one turn.
What happens if I use a joker incorrectly and declare Mahjong?
An incorrect declaration makes your hand dead, so you can no longer win or call a discard, and most groups also stop a dead hand from exchanging jokers. Groups differ on whether a dead player keeps drawing and discarding, so agree on that in advance.
For the official card and rulebook, see the National Mah Jongg League. If you are choosing a set, our mahjong sets include eight matching jokers in the 152-tile count.
About our sets. A SOLMAY American mahjong set has exactly 152 tiles (36 dots, 36 bams, 36 craks, 16 winds, 12 dragons, 8 flowers and 8 matching jokers), each 35 x 25 x 11 mm, with original artwork UV-printed on glossy pearlescent acrylic. Sets are printed to order in Vietnam. Racks, pushers, mats, bags and the yearly card are not included. See the mahjong sets.
Keep reading
- Where jokers fit in a hand: count the groups
- Why all eight jokers should match the set
- Calling a discard
- The first Charleston, step by step
- How many tiles are in an American mahjong set?
These guides follow the way American mahjong is commonly played with the National Mah Jongg League card. Groups sometimes add house rules, so agree on yours before the first hand, and always use the current year's official card. SOLMAY is not affiliated with the NMJL.
