Mahjong School American · NMJL Standard
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American Mahjong School

Jokers: powerful, and tightly fenced in

Eight wild tiles separate the American game from every other variant. They rescue hands constantly — and they cause most beginner disputes, because their permissions are narrower than new player

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Right vs. wrong at a glance

We use real vector tile faces so they stay sharp when enlarged. Below we show whether a joker can complete a group — the exact substitutable patterns come from your current year’s official NMJL card.

✓ Right: joker completes a pung

A joker is a wildcard that can stand in for the third tile of a same-suit triplet (e.g. two Red Dragons + a joker = a pung).

✗ Wrong: joker left as a lone tile

A joker cannot sit alone as a waiting tile in your hand — it must belong to an already-formed group, or the hand cannot win.

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Jokers: powerful, and tightly fenced in

Eight wild tiles separate the American game from every other variant. They rescue hands constantly — and they cause most beginner disputes, because their permissions are narrower than new players assume.

What a joker may do

  • Substitute for any tile inside a group of three or more — a pung, kong, quint or sextet
  • Stand in for a suited tile, a wind, a dragon or a flower inside such a group
  • Be swapped out later: if you hold the natural tile, you may exchange it for a joker sitting in any player's exposed group
  • Be drawn from the wall and kept like any other tile

What a joker may never do

  • Stand in for a required single tile
  • Stand in for a required pair
  • Be passed during any Charleston or courtesy pass
  • Be used at all in hands the card marks as no-joker — most famously in Singles & Pairs
  • Be reclaimed from another player's group except through a legal exchange
Where a joker may (and may not) sit
✓ Fits a group of 3+ ✗ Sits alone ✗ Forms a pair D5 D5 J J D5 J A joker may replace the 3rd tile of a pung, kong, quint or sextet. A joker cannot be a lone waiting tile — the hand cannot win. A joker cannot stand in for the 2nd tile of a required pair.
A joker is wild only inside a group of three or more. It can never be a single tile or half of a pair.
Rule of thumb

Three or more, or nothing

  • Pung — legal. The card wants three 5 Dots; you hold two naturals and a joker.
  • Pair — illegal. The card wants a pair of 5 Dots; you hold one natural and a joker. Hoping does not change it.
  • Single — illegal. The card wants one 3 Dot; a joker cannot stand in for it.
Worth knowing

The joker exchange

  • You may raid any exposure. Hold or draw the natural tile a joker is standing in for, call the exchange, and take the joker — even from an opponent. It is one of the few aggressive moves the American game allows, and it is entirely legal.
  • Order matters: pick → rack → exchange → discard.
  • Never exchange before you pick. Swapping the instant before your turn begins kills the hand.