1 and 2 need a 3
1 and 2 become a Run with a 3, or with a Joker standing in for it.
1 and 2 become a Run with a 3, or with a Joker standing in for it.
1 and 2 become a Run with a 3, or with a Joker standing in for it.
Takeaway: 1 and 2 finish with a 3, or a Joker.
In Mahjong Island, 1 and 2 Characters become a Run only with a 3, or a Joker standing in for it.
There's no 0, so among real tiles, only the 3 Characters fits.
That's why edge tiles are weaker: they finish just one way.
Next lesson: 8 and 9 need a 7
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