Mystical Mahjong is a nice mahjong game. The objective is to clear the board by making matches of free identical tiles. For a tile to be deemed free, it must have at least one clear side (right or left) and it must have no tiles on top of it. There are only a few tiles, like season and flower tiles, which can be matched with any in their own set, so they don't have to be identical.
The game offers four sets with different difficulty levels to choose from, which are clearly identified with their names. All the levels feature a different background. You can restart the game whenever you want and you can undo your last move. If you can't find any match, you can use the hints, but these are limited, so you better use them wisely. All the games are timed and you can see the number of possible moves you have left. The game features nice graphics and sounds, and very pleasant oriental music.
In short, if you are looking for a simple mahjong game that allows you to select exactly the game you wish to play with multiple layout possibilities, Mystical Mahjong may be a nice choice.