One problem

Is that the tiles will not let you chow . Example would be 1,1,2,3, and the tile 1 comes same suit you can only pond , this app does not let you chow this , so as you would have two 1 tiles of the same suit left. Pond only the same goes for any combination of the same in all suits .
5,5, 5, 6, 7,

Idorun about Mahjong 13 tiles, v3.0.4