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Nightmare PN Mickey's appearance is similar to the suit he is based off of, Photo-Negative Mickey, however, his head and gloves are red, his eyes are more human-like, and he has spikes in his eye sockets. His nose is also more round in shape.
In the demo that was given to TwinklePhoneix did a video on, the demo shows Nightmare Photo Negative Mickey at the middle right door, which can be seen when the player would shine their flashlight whenever he is seen at that location.
His starting location and locations he goes to is unknown at the moment.
Once in the Office, he can be seen at the middle right door.