square
Four-sided structure of tiles divided into four cardinal points; each player is a wind from one of those points.
breaking the wall 
Opening in the wall that determines the place from which the tiles will be drawn.
wall 
Each player draws 36 tiles to build a wall that is 18 tiles long and two tiles high; the four walls are joined together to form a square.
West 
Player who is the West wind.
South 
Player who is the South wind.
North 
Player who is the North wind.
East 
Player who is the East wind and who starts the game; this player’s points are automatically doubled.