The gray squares on the Line Join playing field want you to connect them by drawing a solid colored line across the squares. When starting a level, look around the field and mentally draw a connection line, and then do it directly on the playing field. Thus, you will be able to avoid mistakes and do not have to start the level again. With each new level, there are more and more gray squares, which means the line will be longer, and its route will be more confusing in Line Join.
