How Many Jokers Are in American Mahjong?
By Roxanne Corbett, founder of Mischief Mahj
An American Mahjong set has 8 jokers, and they are the only wild tiles in the game.
Where a joker is legal, and where it never is
A joker can stand in for a tile inside any group of three or more identical tiles: a pung of three, a kong of four, or a quint of five. That is the whole list.
A joker can never be used as a single tile or as half of a pair. That single rule shapes more American Mahjong strategy than any other, because a pair is the one part of a hand that cannot be rescued by drawing a joker. It is also why hands built entirely from singles and pairs pay more: no joker can help you build them.
A joker also only works in groups of identical tiles. A run of different tiles, like the four winds together, takes no joker no matter how long it is.
Joker exchanges: getting a joker back off the table
When a player has exposed a group that contains a joker, any player who holds the real tile that joker is standing in for can swap it on their turn. The real tile joins the exposure, the joker joins their rack, and it is wild again.
The window for exchanges opens after you draw and rack a tile, or right after you complete a call, and you can make as many exchanges as you hold matching tiles for before you discard. Strong players scan every exposure on the table before every discard for exactly this reason.
How many jokers can one hand use?
As many as its groups can legally hold, if you can get them. A hand with a pung, a kong, and a quint could in theory carry a joker in every group. In practice most winning hands use one or two, and the hands printed on the current card that forbid jokers entirely are marked as such and score higher for it.