Shriek Mansion 3-4
From the Super Mario Wiki
The level starts out in a mostly dark, corridor in the middle of this room are several platforms, if the player jumps up all of them, they can find a Toad. At the end of the corridor is a Warp Pipe and some more platforms that lead to a door. If the player goes down the Warp Pipe, they will be in an area where they need to use the Slidebrella, this section leads to another Toad.
In the next area are three doors, the first and final doors will lead the player to the other side of the room (and they must return to the platform with the doors), whilst the middle door will leads them to another set of three doors; with this set the first and middle door lead to the other side of the room, whilst the final one will take them to another set of doors. Here, the player needs to go through the third door again to get to another set of doors and like with the previous one they must go through the third door to get to the final set of doors. In the final set of doors, the player needs to go through the first one to get to the top of the room and a Warp Pipe.
The next room has Green Koopas and Lil' Sparkies with several platforms. After crossing the platforms are some more platforms and Fangs which eventually lead to a Warp Pipe. The next area is outside and has a couple of Big Boos and some Glad Fangs, before getting to a door. The door leads to a corridor with a Sad Goomba and some platforms that need to be crossed by using the or . After these is an area with a Puzzle Piece and some more platforms that lead to another Toad, before the end of the level.