Every tile in the hand is a green one: a 2, 3, 4, 6 or 8 Bam, or the Green Dragon.
That gives you six kinds of tile, twenty-four in the set, and only one kind of run to build with: 2, 3, 4. The 6 and the 8 have no green neighbors, so they can only go into pungs, kongs or the pair.
Which tiles are green
The rule is five numbers, not the paint on your tiles.
On many sets the 1, 5, 7 and 9 Bams carry some red alongside the green, and the 2, 3, 4, 6 and 8 do not. Our own drawings keep every cane green, so on this site you cannot tell the two groups apart by color. Learn the numbers instead: the five green ones count, and the other four never do, whatever your set looks like.
The Green Dragon is optional
You may use the Green Dragon as a pung, as the pair, or not at all.
Leave it out and the hand is all one suit, so Chinese Official also scores Full Flush, its one-suit pattern, on top of the 88.
What it scores
Chinese Official and riichi both put it at the top of their tables.
| Style | Value |
|---|---|
| Hong Kong | not on our lists |
| Chinese Official | 88 points |
| Japanese riichi | yakuman |
Chinese Official puts it in the top tier at 88 points, beside Big Three Dragons and Nine Gates. In riichi it is a yakuman whether the sets are concealed or claimed.
In Hong Kong play
None of the three Hong Kong lists we checked includes All Green.
Two of them mention a related hand, Jade Dragon, built from Bams and Green Dragons, but they describe it differently, and Sloper's marks it as a hand not every Hong Kong table plays. If your table scores either one, agree on what it means before you start.
Questions about All Green
What is All Green in mahjong?
A hand made only of the green tiles: the 2, 3, 4, 6 and 8 Bams and the Green Dragon. It is worth 88 points in Chinese Official and a yakuman in riichi. The Hong Kong lists we checked leave it out.
Does All Green need the Green Dragon?
No. The Green Dragon may be a pung, the pair, or left out entirely. Without it the hand is all Bams, so in Chinese Official it also scores as a one-suit hand.
Why are the 1, 5, 7 and 9 Bams not green?
On many sets those four carry some red alongside the green. The rule goes by number, though, not by paint: only the 2, 3, 4, 6 and 8 count, whatever colors your set uses.
Where this comes from
Checked against Tom Sloper's Hong Kong FAQ and his yaku list, Wikipedia on Hong Kong scoring and Japanese yaku, Mahjong Time's Hong Kong, Chinese Official and riichi pages, Yellow Mountain Imports, and Chinese-language Wikipedia's list of Chinese Official patterns. The full list is on our mahjong hands page, and Japanese Mahjong explains what a han is worth.