You can use the A+D keys to shut the doors quicker rather than use E. You should here footsteps for when Miss Shella arrives at the doors, and you should hear a weird "pop" noise when she leaves, I know it sounds weird but trust me on this one.

You should hear light footsteps when Miss Shella stands up in her room. I think it's easier just to keep here there so it saves on power.

Poundinger Shell has to move 4 times to actually get to you. The 1st set of footsteps he's just standing up in his starting location, I think it's cam 1? The 2nd set of footsteps he's out of cam 1.

The 3rd set of footsteps he's in the left hallway.

The 4th set of footsteps he's at the door, you should hear more footsteps to let you know he's gone.

Lazy Shell is quite easy to deal with. You can either shock him when he's in the vent. Or wait until you hear him at the left door. You should hear a vent noise in the left hall to know if he's there.

When he leaves you can hear light footsteps.

Vintage Poundinger Shell is easy to deal with just flip the cams down rather than change the camera because it's more reliable.

PoundShell is no problem at all just spam T when you see him.

For ket you just click on him. The monitors in your office will turn off when he's in.

The Mus-Spiders are basically just Minireena 2 from SL CN.

For NightMadMarrione all you have to do is wind the music box.

SpringShell works like Golden Freddy. Just flip the camera up.

The Dark characters are just faster versions of everybody. But Monkey Mesh can kill you. He has the same A.I as PoundShell.

The Photo Negative Mus-Spiders are faster too. I know it's a lot to read but I hope it helps.