Scene sections?

Hello. Does anyone have any ideas on how I could make a scene be structured like this, where it is almost like a series of mini-levels within the larger scene?

For something like that, my first thought would be to keep everything in a single scene. That would mean you'd be responsible for creating and destroying game objects as necessary to create each level, but for something like what's shown in the video, that shouldn't be a problem.

Keeping everything in one scene would likely be the best way (I suspect) to achieve the level of fluidity and continuity that you see in the video.