Do you think it would be cool if there was ONE way to leave the backrooms that Doesn't give you an ending and that gets you a special item like powerful weapon armor or something that would be cool
no way to escape the inverted world, no. closest thing to escaping is entering the backrooms' poolrooms route from there, but that locks you in the backrooms
You should make it so after a long time in the Backrooms and the inverted world, you can finally go to the normal world and achieve a normal ending (Neutral/GrubHub/Wingman).
