Five Nights at Freddy's (FNAF) started with a modest game in 2014 where players took control of Mike Schmidt, a new security guard at Freddy Fazbear's Pizzeria. The game featured simple mechanics that forced the player to watch security cameras in order to keep an eye on the animatronics roaming throughout the restaurant. If one of the animatronics got too close, players needed to shut them out of the security room before it was too late.
Source:https://www.cbr.com/fnaf-scariest-animatronics/