In Five Nights at Freddy's 4, players take on the role of a child who will be attending a party in five days. As the days progress, the plot reveals that the child is a regular at Fredbear's Family Diner, and the party he will attend is his birthday party. The party he is about to attend is his birthday party, and his nightmare is caused by multiple rumors, a timid personality, and frequent bullying by his masked brother. The end reveals that even if the child escapes the nightmare, he cannot escape the reality of the robot puppet harming himself.

This game's story elements are quite secretive, most of which are carefully noted, deduced and organized by the player to appear relatively complete, so that the background of the entire series is further revealed. Most of the content is to answer the questions accumulated in the first three works. However, the author has taken the initiative to point out that there is still no analysis among the major players and fans that can correctly link all the ambiguities and plots of this work.

Players need to press each location between 12:00 p.m. and 6:00 a.m. on the clock to walk around in first-person perspective, looking at the entire bedroom, bed, closet, and the two doors outside the east and west corridors. During the player can only use the flashlight to obstruct the action of the dolls or listen to the breathing of the dolls at the door to close the door, can not cover themselves in time, they will attack the player when the environment is dark, declaring the game to end in a tragic end.

After completing each night of the over-the-top level. The picture shows the main character and the mysterious little doll.

After the completion of each night, the player will start a mini-game, one is made in the retro style of Atari 2600, hinting at the background of the story more over the level; the other is the completion of the next night will be awarded a shortened relief of two (i.e. from 2AM) hours, otherwise you have to continue the game after being attacked.

Although it is apparently only necessary to complete five nights of the game as per the game title, it is actually possible to unlock the hidden sixth night, and the seventh night named "Nightmare", as well as the eighth night of difficulty 20/20/20/20. Complete each stage can get stars as a reward, all together a total of four.