[TrevorSundberg]

To be honest I haven't spent much time in Unity. Back in the day you either had to parent objects to the camera to make UI, or use a completely different UI system. It sounds like now Unity scenes can be overlaid on top of each other, is that correct?

[Rohansi]

Yes, multiple Unity scenes can be loaded at the same time overlaying each other. Physics can optionally be local to a single scene too.

You also don't need to parent objects to the camera for UI. Not sure how it used to be in the past.