FNAF: Ultimate Custom Night Online is a new FNAF unblocked game that you can play online to go through a new extra side mission from Five Nights at Freddy’s: Sister Location. You will select your favorited animatronic robot before entering the mission. There are a limited number of resources given to you, such as the oxygen and power, so you must use them wisely for your survival. Make sure that you will not let any robots step into your room, try to shut the door in time and always track the movement of the animatronics via the cameras. Will you stay alive until the end? Good luck!
Instructions: Interact with the objects using the left mouse, press keys WAD to close the door.