Welcome to the ultimate FNaF mashup, where you will once again be trapped alone in an office fending off killer animatronics! Featuring 50 selectable animatronic characters spanning seven Five Nights at Freddy's games, the options for customization are nearly endless. Mix and match any assortment of characters that you like, set their difficulty from 0-20, then jump right into the action! From your office desk, you will need to manage two side doors, two vents, as well as two air hoses, all of which lead directly into your office.

This time you will have to master other tools as well if you want to complete the ultimate challenges, tools such as the heater, A/C, a global music box, a power generator, and more. As if all of that weren't enough, you'll also need to set up laser traps in the vents, collect Faz-Coins, purchase items from the Prize Counter, and as always, keep a close eye on not one, but two, Pirate Cove curtains!

This work is a collection of 50 mechanical dolls from various parts of the series. Players can set which dolls to join and adjust their difficulty levels. The game also prepares some challenges for players to play, and also allows players to use props for the game. Players need to be aware of the surrounding temperature, noise, electricity, pipelines, etc. while manipulating doors, monitoring systems, and vents. Players can also choose to appropriately enable music boxes, generators, air conditioners, etc.

Each character has a different attack method, so the player must use the corresponding method to defend. In addition, a character named "Dee Dee" in the game will randomly add other characters to the night to increase the difficulty of the night. Players can get high scores by adjusting their difficulty. After getting a certain score, they can unlock cutscenes, most of which are anime genres.