Add the tiles to make the requested number (eg 10 = 6 +4 or 7 +3). But the only tiles that can be manipulated are required to be free of at least one side and not be beneath another tile.
Mahjong (Shumojong)
Mahjong (Aerial Mahjong)
Mahjong (Mahjong 3D)
Mahjong (Mahjong Deluxe)
Mahjong (Mahjong Burger)
Asobuyo Mahjongg