The Hospital is an area accessible from Graveyard World through the vomiting heart.
Features
This area is quiet, which is to be expected from an area named after a characteristically quiet sort of place (that is, a hospital). When you walk in, there is a waiting room with a vending machine, rows of chairs, and receptionist's window. When you go through the door by the receptionist's window, it will send you to a part of the Hospital Outskirts. If you keep going right and go through the door you eventually come to, you will be transported to one of the keyhole blocks in Garden World.
If you go through the doorway on the westernmost wall, you will come to a series of hallways of patient's rooms that you can go in with altering furniture arrangements. Many are empty, but some contain random monsters that you can chainsaw. One of these rooms contains a pink portal that takes you to the Intestines Maze. You may also come across a room with a moving duvet cover. Interacting with this will make it leak green slime (possibly IV fluid) and you will be transported to Cripple-Tan.
If you walk all the way to the last hallway and go into the first door you see, you will be transported to another hallway which leads to the Hospital Outskirts.
Hospital Outskirts
This area has a psychedelic blue-green background, white paths and calm background music.
From here, the Chainsaw effect can be obtained by stepping on the red teleporter located south-southwest of the entrance to the Hospital Outskirts. You'll be in a small area with lots of vomiting suits and a scrolling background. By entering the mouth of one of the vomiting diamonds, you'll find a lone chainsaw where you can get the effect from.
If you go to the red teleporter near the top of the area, you will be transported to the yellow maze in Geometry World (but only one way).
The soundtrack for the Hospital Outskirts is bgm055 (There is no music in the regular hospital).