This causes genuine confusion, particularly for people who grew up with one version and meet the other. The two games share a tile set and a name. Nothing else.
What mahjong actually is
Mahjong is a four-player gambling and skill game from nineteenth-century China, structurally similar to rummy. Each player holds a concealed hand of thirteen tiles. On your turn you draw a tile and discard one, aiming to complete a hand of four sets and a pair.
Sets are three of a kind, three in sequence within a suit, or four of a kind. When your hand is complete you declare, and scoring depends on the patterns you used, how concealed the hand was, and various bonuses. There are significant regional variants — Chinese, Japanese riichi, Hong Kong, American — with substantially different scoring.
What mahjong solitaire is
A single-player tile-matching puzzle invented for computers. The first widely known version, Shanghai, was written by Brodie Lockard in 1981 and published by Activision in 1986. It borrowed mahjong tiles because they were attractive, numerous and came in natural pairs.
No hands, no draws, no discards, no scoring patterns, no opponents. The entire game is the free tile rule.
Side by side
| Mahjong | Mahjong solitaire | |
|---|---|---|
| Players | Four | One |
| Origin | China, 1800s | Computer game, 1981 |
| Core action | Draw and discard | Match free pairs |
| Hidden information | Yes — opponents' hands | No — everything is visible |
| Scoring | Complex hand patterns | Clear the board |
| Typical length | An hour or more | Five to ten minutes |
Why the name stuck
The solitaire game was marketed using the tiles' recognisable name, and because it reached far more people through computers than the four-player game ever did in the West, 'mahjong' now means the puzzle to a large part of the world's population.
Players of the original game often find this irritating, which is fair — but the naming is too entrenched to change. This site uses 'mahjong solitaire' where precision matters.
What transfers
Only tile recognition. Knowing that 發 is the green dragon or that the character suit runs to 萬 helps in both. None of the strategy carries across in either direction: solitaire is a sequencing puzzle with perfect information, and mahjong is a probabilistic game of hidden hands.
If you enjoy solitaire, the real game is worth a try
The four-player game is genuinely excellent and quite different. Japanese riichi is the most accessible modern version for new players and has extensive English material available.
Why the bonus tiles behave oddly
The flowers and seasons matching any other flower is a solitaire-only convention, and it exists purely because of the tile set. In the four-player game these eight tiles are all different and serve as scoring bonuses, so there is exactly one of each. A matching puzzle needs pairs, so the solitaire rule treats them as interchangeable to make the arithmetic work.