Wild, with limits
How Jokers Work in American Mahjong
Where a joker can go, when it cannot help, and how to exchange for one in an exposure.
Jokers can substitute for a missing tile in a group of three or more identical tiles. They are powerful because they complete pungs, kongs, and quints—but they cannot solve every gap.
Where jokers are allowed
- A pung of three identical tiles
- A kong of four identical tiles
- A quint of five identical tiles
- Larger identical-tile groupings when a card hand requires them
A group may be entirely jokers when the group is otherwise a legal set of three or more identical tiles.
Where jokers are not allowed
- A single tile
- A pair of two identical tiles
- During the Charleston
How to exchange for an exposed joker
If another player has an exposed group containing a joker and you hold the matching natural tile, you may exchange your natural tile for that joker during your own turn. A common sequence is:
- Draw your tile as usual, or begin your turn after a call.
- Announce the exchange and place the natural tile into the exposure.
- Take the joker into your rack.
- Continue the turn and discard.
You may also redeem a joker from your own exposure when you obtain the natural tile. An exposed joker cannot be taken from a dead hand.
Can you call a discarded joker?
No. Once a joker is discarded, it cannot be called and is no longer available for play.
A better way to think about joker value
A joker is most useful when your intended hand needs several large identical groups. Hands built heavily from singles and pairs gain much less from jokers. Let the structure of the card hand determine how aggressively you protect them.