Bit of a random question, but I'm a game dev who is making a bunch of 3D environments (both for experimenting and for fun). I figured I'd make some Harry Potter themed ones that I can walk through. I'm also very interested in the backrooms/liminal-spaces concept (i.e. games like Pools, Liminalcore, etc).

Are there any good settings in Harry Potter that you can suggest would make good liminal spaces to explore? Imagine a character fell into somewhere like the room of requirement while it was damaged and ended up trapped in a dreamy/warped/unfinished version of the wizard world.

For example...

 

The Department of Mysteries had several doors left unvisited in the books. Pretty much tailored to what you want to do here if you get creative and decide to fanfic it up a bit and imagine what lies behind them.

The Triwizard Tournament hedge maze is also a good choice.

 

Good call (to both)!