Hey there! Welcome to the third part of Altering FNaF, where I will talk about FNaF 3.
This one will definetly be shorter than FNaF 1 and 2 due to there being less stuff in FNaF 3.
Without further ado, let's get into it!

1) UI

The UI would be changed drastically, just like FNaF 1 and 2.

Here is the main menu! The layout has been changed a bit and there are also some other small differences.

Here are the new night screens! They work the same as FNaF 1 and 2. Since there is nobody active on night 1, there is nobody on the loading screen.

That is pretty much all for the UI! Let's get into the gameplay.

2) Gameplay

The gameplay would change a LOT. Let's go over all of the characters!

SPRINGTRAP: Activates on night 2, 12 AM. Springtrap is a silent killer. Lure him around with the audio to keep him far away from your office. If he gets in the vents, seal the correct vent as fast as you can. If he enters this new room called 'Breaker Room' then watch him for about 5 seconds to make him stop punching the power generator. If the power runs out due to this attack he will rush towards the office and then kill you.

PHANTOM FREDDY: Activates on night 3, 1 AM. If you hear crying, wait until the sound gets louder. If it gets really loud, his face will start to materialize on your screen. Do not let the face fully fade in or else he will jumpscare you. To make his face fade out, flick the mouse from left to right while having the cams down. Do this until the crying stops and he gives up. If he jumpscares you, then he will mess up your vision very badly and make the ventilation go offline.

PHANTOM MARIONETTE: Activates on night 3, 3 AM. If she is in a room, you should see her mask on a wall. If you do, pull down the cameras or switch the camera. If you don't, she will stare at you while messing up your vision and then make the ventilation go offline.

PHANTOM MANGLE: Activates on night 3, 5 AM. Whenever she spawns, her radio will start playing. Switch through the cameras and find the room where the radio is the loudest and play the audio there. If you don't do that she will lure Springtrap to the office but will also make the audio and ventilation go offline.

PHANTOM FOXY: Activates on night 4, 12 AM. If he is in your office, look at him until he changes positions and do this until he is nowhere to be found in the office. If you did it right, a hallucination should play and a weird screaming sound should also play. If you don't get rid of him fast enough then he will jumpscare you, mess up your vision REALLY badly and make the ventilation go offline. Also, if your vision gets extremely bad then you will pass out and die, so don't let the phantoms jumpscare you too much.

PHANTOM CHICA: Activates on night 4, 2 AM. Sometimes, a Phantom Cupcake will spawn on the opposite side of the building. You will need to catch the cupcake. To catch it, find it and click on it. After you do, place the cupcake in whatever camera you want. It will stay there and make loud noises which will keep Springtrap there for about 20 seconds. If the cupcake reaches your office then Phantom Chica will jumpscare you and do what Phantom Foxy does too.

PHANTOM BONNIE: Activates on night 4, 4 AM. May randomly appear in the office while making really loud sounds which will attract Springtrap. To make him stop, pull up the cameras or the panel and keep them up for a bit. This will make him think that you passed out.

PHANTOM BB: Activates on night 4, 5 AM. If he starts fading into a camera, play the audio lure before he fully fades in. He will mess up your vision and make the ventilation go off if you don't.

Well, that is pretty much it for the characters! The only other change is that systems reboot way faster and the vents seal way faster.

3) Lore

The lore would remain mostly the same, however, Phone Dude would mention that the year is 2023 and he would also mention that the employee's at Fazbear's Frights have started seeing strange figures while working, which would obviously be the phantoms.

The ending names would be changed to "True Ending" and "Fake Ending", with the good ending being the true ending.

4) Misc. Changes

Near the end of night 5, intense music would start to play and the building would start burning. Springtrap would become slower and the phantoms would stop being active.

Time for voicelines, again! Technically, only Springtrap can kill you himself, so there's not gonna be voicelines for the phantoms.

Springtrap's Voicelines:
-[*Groan*]
-[*Laugh*]
-[*You will not be spared. - Heavily distorted*]
-[*The laughs won't fool me now. - Heavily distorted*]
-[*I've got you now. - Heavily distorted*]

FNaF 3 already has an extras menu, however, the challenges would be removed, since there is something new that replaces them. Phantom Mangle would also be added into the extras, unlike the original game.

Custom Night! Yep, that's right! However, this CN has a special feature. You simply cannot start a night if the phantoms are active but Springtrap isn't. There are only 2 challenges, one gives a Golden Springtrap figurine and the other one gives a golden Crumpled Freddy suit figurine.

-Springtrap's Frights
Springtrap: 15
Phantom Freddy: 15
Phantom Bonnie: 15
Phantom Chica: 15
Phantom Foxy: 15
Phantom Puppet: 15
Phantom BB: 15
Phantom Mangle: 15

And then there's the max mode, which is called "Golden Freddy".

Well, that is pretty much it! Thank you for reading, and until my next post... Buh-bye!