It is okay to use a picture that has been drawn with paper and pencil, but the erasing will be a bit more difficult. Lines can be straight or curved. Every at each joint, there is a dot. Every part of the picture is connected to the frame. There is no dot where the lines touch the frame.
Every line has a dot at both ends, unless the end touches the frame.
A line can begin and end on the same dot. If, after that one line is removed a part of the picture has become disconnected from the frame, that section of the picture must be removed, also. Notice how, in the example below, if the line shown in green is removed, all the red lines must also be removed. In the next example, no additional lines will need to be removed when the green line is erased. The player who removes the last bit of the picture, leaving only the frame, is the winner.