Rats are the most common enemies in the Bathroom Nightmare in the Nightmare Ned game, all of which work for the Bathroom Shadow. They aren't very intelligent. However, they have good throwing skills, which is why they continously throw Electro Beavers into the tubs that Ned uses to cross gaps. They also have their own song which can be heard during this time. Also, in the beginning of the stage, a group of these same rats are falling from a pipe with a fan in it, and Ned must hit these mice to make a bridge out of them.
They also appear in the Attic, Basement and Beyond Nightmare, where they encounter Ned along with the Furnace.