Nine Men's Morris is a strategy board game for two players dating back to the Roman Empire. The game is also called Mill or Windmill. The board consists of a grid of 3 squares one inside the other, with lines connecting the 24 intersections on which pieces can be placed. Move your men to create a mill. Place all of your pieces, or men, on the board and move them to form a line of three pieces (this is called a mill). Once you form a mill, you can remove one of your opponent's men. Break a mill to unlock the mills again. Pieces from a formed mill can't be removed unless no other men are available. The aim of the game is to leave your opponent with either two pieces or no remaining moves.