As for a particular room, it depends what you mean by messiest. If you just mean that things need to put away, it'd be the family room because that's where the kids drag out their toys and where they like to draw and paint (and then leave all the supplies and pictures right there on the coffee table). If you're talking about a room that actually needs to be cleaned rather than just stuff put away, that would have to be the girls' bathroom. No matter how many times I tell them, they just can't seem to rinse the excess toothpaste out of the sink after they brush their teeth. Then it dries on there and gets stuck. Fun fun. We also have one "hotspot" in our house where things pile up quickly and that's the kitchen counter....it's the first flat surface that is there when you enter the house, so it becomes a dumping ground for purses, keys, mail, jackets, etc. I "police" it several times a day to try to keep it clear so it doesn't turn into an inferno!