The story of FNAF

They said that animatronic movement is a "free-roaming" mode that is a program on purpose to keep the servomotors from locking up. From 12 a.m. to 6 a.m., the player must stay alive. To protect themselves from the animatronics, they can only use a camera system and two doors with lights. The hostile behavior of the animatronics seems to come from the angry spirits of children who died at the restaurant. The previous night guard, "Phone Guy," guides the player and helps them fight the animatronics. After seven nights on the job, Mike is fired. Because "messing with the animatronics, having bad body odor, and being generally unprofessional."

The Five Nights at Freddy's series is a group of horror-themed video games. In which the player is usually a nighttime worker at a location connected to Freddy Fazbear's Pizza, a fictional children's restaurant that is based on Chuck E. Cheese's and ShowBiz Pizza Place. 

At children's parties, the restaurant's life-size, moving robots put on shows. At night, the animatronics walk around the restaurant, and the guard must keep an eye on them. To move through the games, the player needs to use a variety of tools to protect themselves from the moving parts. In Five Nights at Freddy's, the player can control the two security doors that lead from their office to the hallways next to it. These doors act as a barrier between the player and any animatronics in the area. The player receives a set quantity of power each night, which diminishes faster when using a tool.  If the power goes out, the player can't use any tools and has no way to protect themselves from the moving parts.