how do I open this?
You must have Unity 3D engine. After you extracted the project, in Unity Editor click File > Open project and choose Backrooms project folder. You can also open a scene in Assets > =Scenes= to open the project.
You must have Unity 3D engine. After you extracted the project, in Unity Editor click File > Open project and choose Backrooms project folder. You can also open a scene in Assets > =Scenes= to open the project.