Eliminate tiles from the mahjong board by clicking on open tiles in pairs. If you click on a tile that is not open, the board will gray out all mahjong tiles which are not currently open to be used. This will give you a clear view of those tiles open at that moment. Match all the summer mahjong tiles and you win!
Mahjong solitaire has wild mahjong tiles which can be matched to any other mahjong tile in their set. These mahjong tiles are shown below. Be sure to take a good look, as these may be your saving grace in some of these more difficult boards.