Since I've been very inactive here, I'm gonna explain some mechanics!

OFFICE & CAMERAS

So, the general gameplay works like the average fangame concept: Use the cameras, keep an eye in a super original music box with a Puppet, put the mask when certain characters enter or close the closest door for Chica or Freddy.

You'll also have to flash Freddy and Foxy when they appear since they mask doesn't work with them.

ANIMATRONICS (and shadow)

CHICA AND BONNIE: They will go first to the security office (you are in another office since the other had problems). Once they confirm that you aren't there, they will go to your location.

Once they are right outside you can do 2 things: wait for them to enter and put on the mask or not letting them getting to the desk, Bonnie with the flashlight and Chica with the door.

FREDDY AND FOXY: The mask won't work this time, so you'll have blind them after they arrive to the desk. Freddy will follow the same path has Bonnie and Chica, but Foxy will go directly to the vent system, which you let Foxy right above you. Once they show up, blind them with the flashlight and they will leave the office for a bit.

BB AND PUPPET: Pretty much like in Fnaf 2, only that BB will play a music box and the Puppet will be more visible while she's getting out of the box.

RABBIT SILHOUETTE: He was originally like Golden Freddy, but after make his new design (the one I showed), I see that he deserved more participation.

I haven't fully finished his mechanic, but he could start from a ballpit and showly go to your office.

THE GARB (or costume): He works like a Golden Freddy, but you'll be able to see him on the basement camera (where Foxy is) and how he slowly starts moving before teleporting to your office. Just put the mask when he appears.

His mechanic could change a bit on the final game

If you're asking where's Sparky, I haven't found a good mechanic for him yet. He could problably be similar to Bonnie and Chica or do something like cover the camera vision with his face.

If someone has ideas for him, feel free to comment them.

NIGHTS

Obviusly there's 5 main nights, plus a sixth one and a custom night.

I won't reveal much stuff about them, so I'll only say that in night 1 Bonnie and Chica will be active, on night 2 Foxy, Puppet and BB could join, on night 3 Freddy and The Garb (and Sparky too if he ends up on the game) and on night 4 Rabbit Silhouette. The rest I'll keep it for the full game.