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The Five Nights in the Teddy Bear's Harem master series are thriller-themed video games in which players serve as night guards at "Freddy the Fancy Bear's Pizza Restaurant" or its associated locations. In each game, players need to survive 5 nights (with the exception of the pizza restaurant simulator, which takes 6 days), and the difficulty increases with each night. There is an unlockable sixth night (except for the sister location and the pizza restaurant simulator), and additional nights (except for the third game): the first two games have a customizable seventh night that allows the player to customize the AI level of the mechanical dolls; the fourth game has a seventh night (Nightmare Night) and an eighth night (20/20/20/20 mode); the sister location has a customizable Night DLC [20]. Sister Places is the only game with only five nights (excluding its DLC); and Pizza Restaurant Simulator is the only game with only six days and no nights.
The fake endings and custom nights of the first three games and the sister locations feature CCTVs, which are considered by players to be a "classic" of the series. Players can confirm the location of the mechanical dolls through the CCTV. Players can only observe one location at a time, and some areas may not be viewable through the CCTV [1]. Most of the monitors do not have good picture quality, sometimes the colors are even black and white, and full of noise. In the third work, the monitor may also be unusable due to errors [21]. The player can use the monitor to perform some operations elsewhere, such as lighting a specific place in the second game.