Use the mouse to draw an object.
You cannot draw inside other objects.
Draw a circle by holding the left mouse button.
You can use pins and hinges to link two objects together.
Hold S and click inside an object to draw a pin. Draw a second object on top of the pin to link the two object together.
Hold D to draw a hinge. It works the same as with a pin, except that now the two objects can rotate with respect to each other.
To erase a single object hold down A as you left click a shape.
Hold W and left click to gently push the red shape in a certain direction.
Press space to restart the level.