Press the green flag to start. Use the up arrow key to draw up. Press space to erase all and start fresh. Use the down arrow key to draw down. Use the left (<-----) arrow key to draw left. Use the right (----->) arrow key to draw right.
This is a drawing tool. The color of the marks is the same as the color of the pencil tip. Once you have drawn something you cannot erase it. There are pencil drawing sounds in the background. (The sounds are not long.) When you scroll with your mouse the pencil writes (I don't know how to fix it) so I am sorry about that.