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Freddy can't enter your office if you're looking at the Kitchen when she's there. Should save you a lot of power.

I've discovered in my own gameplay that the devs paid good attention to how FNAF works. You actually don't need to close the door on Freddy when she's in the Kitchen. As long as your camera is on the kitchen, she can't enter your office. Should save a lot of power.

Foxy should be slowed by checking the cameras at all, however she's much more aggressive than Foxy in FNAF and her movements seem to be random (or I'm catching the wrong moments to not have my cameras up). For good measure, if Freddy is in the kitchen, close the door and check Booty Cove to see Foxy's progress and then switch back to the Kitchen before opening the door again. You should also do this when Chica attacks to take advantage of the closed door, however on 4/20 she and Bonnie leave the doors pretty quickly.