Game play:
In said game, the player can control the two security doors connecting their office to the adjacent hallways as a barrier against animatronics in the vicinity.
Each night, the player has a power supply that depletes faster when a tool is used. If the power goes out, the player can no longer use any tools and is defenseless against the animatronics unless a shift ends before main animatronic Freddy Fazbear can attack.
This is a point and click game, Clicking the computer in front of you; you can go to different cams. (cam 1, cam 2..so on so forth) There are 4 animatronics! Freddy Fazbear, Bonnie the bunny, Chica the chicken, Foxy the Foxy.
Bonnie comes from the right with foxy when he comes running (night 2-6/7) and chica comes from the left door with Freddy when he comes in the last(ish) night.
Lore for fnaf 1:
The pizzeria itself is in a state of disrepair thanks to a series of tragedies associated with it, namely the kidnapping and likely murder of five children by a man named William Afton.
It is rumored that the victims' bodies had been stuffed inside the many animatronic mascots of the pizzeria, named Freddy, Bonnie, Chica, and Foxy, which had led to a widespread boycott of the business and directly led to its demise.
With the protagonist monitoring the animatronics at night through the use of security cameras, it quickly becomes apparent that these rumors are true, with the mascots moving freely throughout the facility, edging closer and closer to the player's location with malicious intent.
The player can only survive the lengthy period in the facility by managing the power supply of doors and lights, ensuring that none of the possessed animatronics can get close enough to inflict a mortal wound.