Making a world map for levels

I am making a level-based platformer, and I want to make a map that connects the worlds, like how the Mario games do it.
I also have no coding knowledge in GDevelop, so I will need help if that is necessary.
Here’s a picture of an example of what I’m talking about:

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I was thinking the same world, but currently too busy on the first level but the platforms sometimes bugs me when the player getting “push” out to the edge of a cliff.

Once I made a map in which you could move and choose the levels, it would be best to make a separate scenario where you make the map, make your character move in 4 or 8 directions and that when colliding with “something” take you to the stage of the level you want, if you want the levels to be unlocked when you finish a level you would have to use global variables.