Mahjongg

 The objective is to remove all 144 tiles from the board; for each pair of tiles removed you will get two points.

The rules:

Starting from the sides, or from the central tile at the top of the pile, remove tiles by clicking on two equal symbols. If the tiles are identical, they will disappear, and your score will rise.

Selectable tiles always must have at least one empty side. If on both sides of a tile there is a neighbouring tile on the same level, it cannot be selected.

                
Note: The four tiles showing season symbols (above, left) match even if they are different; the four flower tiles (above, right) match respectively.