Springtrap

FNAF 3 has one animatronic that can actually kill you, and this is it. Everything else in that building is a phantom that only exists to knock out your systems - and the systems are the only thing keeping Springtrap on the other side of the wall.

How the FNAF 3 night works

• Cameras - lose them and you have no idea where he is
• Audio - plays a child's voice in a room you pick, and he walks towards it
• Ventilation - leave it down and the hallucinations start
• Rebooting a system takes several seconds, and he keeps moving the whole time
• Never reboot two systems back to back unless you know exactly where he is

Using the lure properly

Play the audio two or three rooms away from wherever he currently is, not right next to him - the point is to pull him along a corridor, not nudge him one door closer. And keep the ventilation up, because the phantoms that appear when it fails are what cost you the camera feed at the worst possible moment.

What he actually is

The spring-lock suits were built to work two ways: as a costume with a person inside, or as a standalone animatronic. When the locks failed with someone wearing it, they closed. William Afton climbed into one to hide, and thirty years later the attraction owners found it and put it on display. That is the whole game.