How do you beat level 3 on windosill

You have to click the cloud on the right. After the rain drop comes out, you have to click on the puddles it made a couple of times. It will then give you a worm. You have to feed that worm to the bird. In exchange, the bird will give you that box thing. Put the box in the square, open the door, and then you're on to level 4 (it rimes :D)! Hope that helps!