There's a hidden area underneath the Retail Showroom that features a secret moon animatronic boss fight in FNAF: Secret of the Mimic.

True “moon face” is brought on by a “buildup of fat deposits throughout the face and it’s usually due to excessive cortisol production,” said Rocco.

Players need to acquire some giftbox collectibles to complete the Moon mini-game and get the secret ending for FNAF: Secret of the Mimic.

True “moon face” is brought on by a “buildup of fat deposits throughout the face and it’s usually due to excessive cortisol production,” said Rocco.