The video game series began with the eponymous game developed and published by Cawthon for Microsoft Windows in The series is centered on the fictional Freddy Fazbear's Pizza, a pastiche of pizza restaurants such as Chuck E. Cheese's and ShowBiz Pizza Place. In the first three games in the series, the player controls a nighttime security guard at Freddy Fazbear's Pizza, who must utilize security cameras and other tools to survive against animatronic characters which become mobile and homicidal after hours. The fourth game in the series takes place in the house of a child who must defend against nightmarish versions of the animatronics.
Update, September 14th: Shortly after this post, Five Nights fan games really took off. At one point, I had hoped to compile a new list of the games on Game Jolt, but, well, there were of them. I know, right? Game Jolt chose to section Five Nights fan games away from the main stream, as they were flooding everything else out, and currently hosts over 4, in various stages of completion. I realised how big it was when Fazbear and friends usurped Slender Man as the most popular fan game subject on Game Jolt. And that is only on one site. And only since September.