Your objective is to either electrocute the chickens on the level or kick them off so they fall out of it. To do this, you are given several items (top left corner) that you can choose with your mouse or finger and drag to wherever you need them.
Almost all levels will have a generator, this generator (the box with lightning on it) electrocutes any chicken that comes into contact with it or is standing on a metal surface touching the generator.
Your task is to use the items you have (steel beams, electrocuting balls and many other items to experiment with) to make sure all chickens have met their doom.
There is no right way to solve this! So feel free to get creative!