Ice Dao is a 2 player Icehouse game.Player alternate taking turns,on each turn a player must move one piece as far as it will go in one of eight orthogonal or diagonal directions.A piece´s movement is subject to the following restrictions: 1.A piece must stop at the edge of the board. 2.A piece may not land on or pass through a square that has a piece of the same size or smaller. 3.A player may move only the top piece in a stack. A player wins when they get 4 pieces in a straight line(orthogonal or diagonal). The rules are available online