A reasonably good and authentic Hong Kong mahjong game on the iPad available for $1.99 from the Apps store. If you have no knowledge of mahjong nor know the game rules, this will not be for you. It is however a good alternative for those who enjoy the intricacies of mahjong. One thing I don't quite like about it is its not so sensitive to touch "pong" icon although that might be because the time set was at the maximum speed. A better solution would be to slow down the time lapse for "pong". Otherwise, it's a real good game for $1.99!
Incidentally, I found the music and sound irritating so I off them most of the time!