The demsel in distress in stuck up high on a burning ladder.
You, Spiderman is swinging mad using the three hooks on the top of the frame. These hooks are the centre of the swing circles. By clicking on the hooks, you can extend or shorten the radius of the swing. At each click, the radius is changed to the distance between your current position and the clicked hook.
The aim is to get the girl to safety while avoiding crashing onto the red building below. And oh yes, the monster is trying to get to the girl, too...