Use your Mouse to draw shapes as you try to get the red ball to the flag.
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.
Hold [A] to erase a single object as you left click a shape.
[SPACEBAR] restarts the level.