You start out as Raccoon Mario mainly because I didn't want the transformation sequence be a nuisance when walking up to the house's entrance.
The "spooky" piano sounds are red music blocks with Munchers hopping around on them producing cliché scare chords.
The entrance itself has Spike Traps so the player cannot abuse their Raccoon powers and fly out of the level.
The doors should signal what I was going for: Random death traps in a scary house. But instead of just being (relatively easily avoidable) death traps I wanted the player to do something to get out of there.
So the first door leads to a fire hazard course, which originally had some Kameks in it, too, but that got WAY to hard with all the fire in there. Some Fire Bars were there too, but again, that section would've been way too hard with them still there.
I'll skip the second door for now and get straight to the third door: It leads to a simple "LOL NOPE" kind of moment where you hear something crash down from above, just to see that it's a giant Thwomp, quickly crushing its way towards Mario, crushing him if the player isn't smart enough to quickly exit the room through the same door.
Door number four just leads to the exit of door number one.
Now door number 2. This leads to a falling scene where you can clearly see a giant Bowser Jr. falling to his death. This is supposed to be the first hint that there are other people in the house suffering some kind fate because of its death traps. It's also supposed to show how gruesome the big boss of this house can be, sacrificing his only child because of God-knows-what. Anyway, a well placed arrow tells the player to steer towards the right side of the room, where he will land safely on a small "island" of sorts with a pipe on it, leading to the basement of the house.
The crates you land on are supposed to be filled with spare parts of the giant machinery that the house is made out of. No way to show this, so the player's imagination is supposed to handle that. The player also immediately notices the giant saw blades with platforms above them, so the player gains an easy and safe way above the machine, up on the catwalk where he will see how the machine works. It spits out other "people", screaming for their lifes, hopelessly of course, as they immediately get grinded by the saw blades. I found it funny, yet scary how the Hammer Bros always get to chuck one last hammer before dying horribly.
The other side isn't much better. The player sees other "people" and a bowl of sorts, getting filled with them. Nothing else is happening, until the player jumps up to the second catwalk, where he notices another giant Thwomp. The Thwomp was positioned just so that the player cannot avoid it under any circumstances. He is forced to provoke the Thwomp so it falls down, crushing everyone beneath him.
The player continues his way, noticing all the cells (which are actually supposed to hang from the ceiling, but the way the camera works in Mario Maker you cannot see that, sadly). One Bob-Omb goes crazy and suicides, a Wiggler is also stark mad, a Spike Top has gone so crazy he walks up and down the walls and a Koopa Troopa became a Dry Bones, while many before him already died and rotted away in the same cell.
Then follows the player's possible escape. He walks through the door, a light is shining above him through the window through which a Super Leaf from outside made its way. The player is basically forced to grab it. The arrows are signaling to run around and fly up. Munchers are placed so the player is forced to lose his newfound raccoon ability and quickly go through the door.
While writing this I just noticed that you can get stuck in this room by losing your raccoon powers and falling down instead of going through the door. Sorry about that.
Anyway, the player goes through the door, where the big boss, the puppeteer, Big Bowser awaits him.
This battle is basically exactly the same as in Super Mario Bros. 3. I noticed that Bowser has different abilities in different Mario styles, so recreating the Bowser fight from SMB3 was a fun thing to do, although I had to work around Mario Maker's limitations once again, though using Bowser-actived P-Switches to let him fall to his doom AND opening the way for the player is something I'm kinda proud of finding it out but I don't think I'm the first to find that out.
The pipe leads once again outside and to the goal. Mario just got through a very horrible night.
There is a small easter egg in the entrance area of the house: to the right of the fourth door you will see a room filled with coins. You can actually get there. But how you can get there, you have to find out yourself (it's very simple actually).