Is it possible to have a single, master level blueprint that all levels use?
I have 10 levels. All the level blueprints are almost identical, only slight differences. Making changes is a pain because I have to copy the change, open each level, paste in the changes, and save. A single, master level blueprint would streamline my workflow.
You should create a Blueprint actor that you place in each level. Put what you need in it’s BeginPlay event. Then add public variables for anything you need to change per-instance. You may find you actually don’t need use the Level Blueprint so much for a lot of things once you learn more about blueprints
There is something like that and called GameMode class. GameMode class should contain common logic for entire game or rether game mode as name suggests. It should control all the game rules.