Entire new mechanics are introduced (Such as vent sealing, ventilation systems, audio systems, and having to reboot all of your systems including cameras.) For starters you're only chased down by one real animatronic, he makes up for this by being FAR harder to see in the cameras and being much more aggressive overall. Entire new mechanics are introduced (Such as vent sealing, ventilation systems, audio This installment drastically changes the entire game. This installment drastically changes the entire game.