Mahjong solitaire only lets you remove a tile if there isn't a tile directly above it, or the tile can't slide to the left or right.
Although the rules are simple- the game can require quite a bit of strategy and forethought!

Classic Mahjong for mac has many great features, including.
* Multiple layouts, so you can play different levels to suit your skill.
* Multiple tileset graphics. Choose a tileset to suit your mood.
* Clear 3D graphics
* Statistics
* Funky sound effects
* Full undo and redo
* Detailed help. Classic Mahjong for Mac is the perfect game for beginners, because it shows you exactly how to play.

System Requirements
* Mac OS X 10.3.9 or later