Mahjong online (Mahjongg, Mahjong Solitaire, or Shanghai Solitaire) uses 144 tiles. When you start the game, these tiles are placed in a four-player pattern. You can’t see tiles hidden beneath other tiles. You must remove the upper tiles and expose the tiles underneath. You can only match two identical free tiles. A free tile is the one that is uncovered and unblocked on its left or right...