The Pseudoor is an enemy in Mother 3. They can be encountered on the third floor of Osohe Castle in Chapter 2, and disguise themselves as the castle's doors, attacking when Duster tries to open them. Its name is a portmanteau of pseudo and door, naturally meaning "fake door". Despite their appearance, their are subtle differences between Pseudoors and normal doors: they have a fairly noticeable black stripe under them, while normal doors do not. Also, Duster can simply check his map to determine if the door is real.