You need to help the worm get to it's hole. Click on the worms head to drag it where you want. It will not be as simple as it sounds. Some levels will have mushrooms that you must wrap around to light up and they must be lit in order to get your worm to the hole successfully. Other times you will need to light up the mushrooms and stretch the worm out completely. Another difficult level is getting the worm to it's hole, lighting up the mushroom, stretching out the worm completely, and only being able to surround the mushrooms once.