The player must close the right door to send Nightmare back into the darkness. He is invisible to the player and approaches the right door, with only his eyes indicating his presence. Nightmare appears in the Ultimate Custom Night update alongside most of his fellow nightmare animatronics. He is acknowledged in the gallery as a separate entity from Nightmare Fredbear, meaning that he must have some sort of significance. His existence is unexplained, and his purpose is unknown. Upon being attacked by him, he will appear in a screen similar to Golden Freddy instead of a complete animation.
Also, he always directly appears at the doorway. He must be handled the same way, but Nightmare is more aggressive than Fredbear. Just like Fredbear on Night 6, on Night 7 and Night 8, he takes the same role, appearing at 4 AM, and replacing all animatronics, taking up their duties. He is black with a yellow hat and bow tie, the yellow hat having a black trim on it. However, it's just his endoskeleton's head. Upon closer examination, a black mass seems to reside in Nightmare's head. Unlike Fredbear, his skin is translucent, exposing all of his animatronic parts. Nightmare is clearly based on Nightmare Fredbear, being some sort of demonic version of the already demonic looking Fredbear.
