1. Click on the “Green flag”: everything is reset to original state. 2. Press "s" to draw the squares design, and “t” to draw the tunnel design.
This is a program in which you draw a few interesting “square” designs. A number of buttons (with names of designs as labels) are lined up at the bottom of the screen. When you click one of them, a design is drawn on the screen. You can control the resulting design by entering some inputs, such as, the size of each square.
