In-Poculis Mahjong (http://www.in-poculis.com), a Mahjong solitaire game for Mac OS X, has been updated to version 3.1 The game comes with 120 levels and six themes: Christmas, Halloween, Asian, Easter, Wonderland and Future.
Here’s how the game is described: “How to play: find matching mahjong pieces amongst the plethora and click them to get them off the screen. All of the mahjong pieces can be cleared, but it takes some discipline, strategy, and a little bit of luck to win the five medals of each theme.”
In-Poculis Mahjong is free. However, if you like the game you’re encouraged to donate to fund future development.