MENUDot Drawings
Each drawing is made of lines between dots. Draw both drawings together on the empty dots, as if one lay on top of the other, as in the example. Click two dots to draw a line between them. Click the same two dots again to rub the line out. When you have drawn as many lines as the answer needs, a mark shows if it is right. Reload the page for new drawings.
How to add two drawings
Put the two drawings on top of each other without turning them. Every line that is in at least one of the drawings is in the answer. A line that is in both drawings is drawn only once.
Example 1: no line in common
The first drawing is the left side and the top, the second one is the bottom and the right side. Together they make a square.
Example 2: a line in both drawings
The short line from the top middle dot to the center dot is in both drawings. The answer has it once, and the two drawings join into the letter I.
Overlapping Pictures