You have to free the Butterfly. If you don't, all of humanity will be lost and the race of the butterfly will have been forgotten. In order to free the butterfly, you have to destroy all of the blocks that surround the fairy. In order to destroy all of the blocks you have to shoot a ball in to them and continuously catch it and have it bounce back up in to the blocks to break some more. Use the mouse to move the bar at the bottom that will keep the ball bouncing around. Continue doing this until you have released the butterfly from its prison.