If your doors randomly stop working, it's these two guys. They're active and moving from Night 1, and they will work as a team to get you.
They can also mess up camera feeds, causing you to lose track of Freddy. They both stick to a different door and can jam them, letting the other run inside. You can use the lights and the non-jammed door to your advantage here to keep the partner out.
If you die at any point in this game, it will likely be from them.
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Five Nights At Freddys 1, 2 and 3 Characters Guide!
RandomA guide to all the characters in FNAF 1, 2 and 3! hopefully this will help you understand them and what they do a bit more than you did earlier!