On this page of our Little Nightmares 2 guide, you will learn how to get out of the wheelchair room in 3rd chapter of the game. To get out of there, you have to move the wheelchair, which will initially be too heavy for Mono.
Entering the room
To get into the room you, have to turn on the light and take up one soap. You'll need it to open the door.
Throw the soap at the button, which will open the door and allow you to enter.
Moving the wheelchair
At first, a wheelchair may seem unmovable to you. This is because the figure sitting on it is too heavy to push it.
So go back to the light switch. Turn off the lights and listen to the sounds. Within seconds, the monster should appear. Stop him with a flashlight, then turn on the light.
Then all you have to do is return to the wheelchair and push it to the door. This is how you get out of the bathroom.