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[Obliviator27]

so basically like doors? To change music when player enters into that area, etc ? I had this idea but had to confirm it too

You can think of it this way.

Player enters an area for the first time. Certain scripts are called, usually from the OnStart

Player leaves the map, but then returns to it. OnEnter scripts take effect upon returning, ans OnLeave take effect upon leaving.

But basically, with leveldoors, yes.