There is a bug in version 1.1. The application abruptly quits (every time) back to iPad home screen when the settings button is pressed. Issue reported to developer, but to no acknowledgement.
There is opportunity in the game layout design; the tile sort is not logical (ie suits are not grouped together), then auto sort kicks in after messing up my manual sort. There is no score keeper, or how much you won or loss each round. No multiplayer capacity.
Low replay value. Recommend "Four Wind Mahjong" for iPad.
Rayman12345 about Mahjong!, v1.1