Imagine a Five Nights at Freddy's 3 at an amusement park. It takes place 20 years later and it is still the same way for the guard, but at the same time it's not. You have to sit in a hotel's security room and watch the cameras of course. But you also have to keep an eye on one important thing: The kids. The animatronics have gained access to the kids' rooms through eye recognition in the systems. They often have surprise birthday parties during the day for the children, so during night they are allowed to go in. It takes exactly four seconds for the eye scanner to scan their eyes and open the doors. You have a chance to lock the door via controls in the control/security room. However, if they get in, they will ignore the parents and lure the children out into the hallway with a song. You can flash your light at them, but there's a chance that they will get too angry and attack the child and wake up another animatronic, a new one, that absolutely loves children, and will attack you.
Newer faces, same old faces, things are different and the same. Welcome to Freddy Fazbear's Fazbear World.