Your goal is to build walls to surround all the dots. Click to place a wall horizontally, vertically, or diagonally. Single dots need to be surrounded on three sides, with a wall running right through the middle of it. Dot pairs need to be completely surrounded on all sides. In later levels you'll need to surround all the dots with the right amount of loops shown at the top of the screen. Loops can't touch, so you may need to try a few times before you can find the right solution!