Joker rules in American Mahjong
Eight jokers, a few firm limits, and one move that catches beginners out: taking a joker off someone else's rack.
Updated November 9, 2026
Where a joker can go
- Yes: any group of three or more, whether it's on your rack or exposed, including a group of flowers. Three 5 Dots can be two 5 Dots and a joker, or even one 5 Dot and two jokers.
- No: a pair, or a single tile. That rules jokers out of Singles and Pairs hands entirely, and out of any part of a hand made of single tiles, like one of each wind.
The joker exchange
When a player exposes a group with a joker in it, that joker is standing in for a specific tile. If you hold that real tile, then on your turn you can put it on the exposure and take the joker back to your rack. You can exchange from any player's exposure, including your own.
It's one of the most useful moves in the game. A joker on your rack can finish almost any group, so watch every exposure for a joker you can buy back with a tile you don't need.
Discarding a joker
You can discard a joker, but think twice: it's the most flexible tile in the game, and it can help the player who needs it least. A discarded joker is dead. No one can call it.
Jokers in the Charleston
Never. Jokers stay on your rack through every pass, including blind passes and the courtesy pass. See the Charleston.
The jokerless bonus
A winning hand with no jokers in it is worth double.
How it works in Mahjong Alley
The app knows what every joker on the table stands for. It won't let you pass a joker, use one in a pair, or call a discarded joker. Exchanges happen on your turn, after you draw and before you discard. With Joker swap hints on (they're on unless you turn them off), any joker you could win back gives a little wiggle on your turn, so you never miss one.
Joker exchanges also earn things: some joker designs in your Collection unlock when you exchange jokers.