The game does not allow a player to call for discarded tiles. The user guide states this is done automatically. This feature fails most of the time. The instructions also ignore the many variations of the game (Hong Kong, Japanese, American, Wright-Patterson, and so on) and do not specify which version this is. Calling tiles is the essence of the game - future versions should allow the player to play. Would not have bought this game if I had known it was almost unplayable.
KF5EPM about Four Winds Mah Jong, v3.1