The short answer
Use a Joker in a required group of three or more identical tiles. Never use one for a single or a pair. A discarded Joker cannot be claimed, even for Mah Jongg.
Practice placing a JokerOn this page
Where a Joker can go
A Joker can replace a natural tile in a required group of three or more identical tiles: a pung, kong, quint or sextet. A natural tile means the actual tile you need, rather than a Joker.
Original group example
A pung of 4 Dots
The Joker stands for another 4 Dots. This can fill the pung if that is the group your card hand requires.
The key is identical tiles, not simply the number of tiles printed together. A block containing different numbers or Winds does not become Joker-eligible because it has three or four symbols.
Why singles and pairs are different
A Joker cannot stand for either tile in a pair, or for an individual single. This remains true when that tile would finish the hand.
Allowed group use
Three identical tiles
Two 4 Dots and a Joker can supply a pung of 4 Dots.
Not a completed pair
A pair of 6 Bams
This needs another natural 6 Bams. The Joker cannot fill the pair.
The same restriction applies to separate Winds printed as NEWS: North, East, West and South are individual requirements, not four identical tiles. Keep the needed natural tiles.
Calling a final natural tile can sometimes complete a single or pair. Using a Joker there is still not allowed.
How a Joker exchange works
During your own turn, after drawing or legally calling and completing an exposure, you may exchange the exact natural tile for a Joker in an exposed group. You cannot redeem a concealed Joker.
- Identify what the exposed Joker represents. In an exposed pung of 5 Craks, it represents a 5 Craks.
- Use the matching natural tile. Replace that exposed Joker with your natural 5 Craks and take the Joker into your rack.
- Finish your turn. Usually you still discard. If the exchange completes a valid current-card hand, you may declare Mah Jongg instead.
Do not take a discard merely because it would let you exchange a Joker. Claiming a discard first needs its own legal reason: a completed allowed exposure or a valid Mah Jongg.
Passing and discarding
- Keep Jokers during the CharlestonDo not pass them in a Charleston pass. Choosing tiles to pass is different from discarding during play.
- A discarded Joker cannot be claimedNo other player can pick it up for an exposure, a swap or Mah Jongg. If you discard a Joker, it is no longer available to help another hand.
Joker rules sit alongside the rest of the card requirements. They do not change the required suits, numbers or exposure restrictions.
Your next small step
Try the Joker decisions
The existing foundation drills let you choose a legal Joker position, protect a natural pair and make an exact exchange. They check the stated example, not a real annual-card hand.
Free to use. No account needed. Your answers stay in this browser.
A few common questions
Can I use a Joker as the last tile of a pair?
No. A pair requires two natural matching tiles. A final-tile calling exception never makes a Joker legal in a single or pair.
Can I redeem a Joker when it is not my turn?
No. Wait for your own turn and follow the exchange procedure. An exposed Joker is not a discard you may simply claim.
Can I pick up someone else's discarded Joker?
No, even if it seems to complete your hand. Let that discard go.
Rules & further reading
Rule references checked October 21, 2026. The AMJA guides are explanatory resources from a separate association. Your current NMJL card and official updates still govern real play.
- AMJA: Jokers and Joker exchange
- Mahjong 4 Friends: Joker rules
- NMJL: current card and official resources
Mahjong First is independent and is not affiliated with or endorsed by NMJL. These original examples do not reproduce an annual card or validate a complete hand.