How to mask/darken lower floor?

I'm building a small, multi-floor castle where I created a central courtyard. I want the courtyard to be visible on all levels of the map, but as you go higher it becomes less visible. Basically I want to mask a lower level either lightly or heavily depending on how high you are. Examples:

On floor 2 there will be a light gray mask on Floor 1.

On floor 3 there will be a light gray mask on floor 2, and a dark gray mask on floor 1.

I tried to do a search but couldn't find what I was looking for. Would this be easier to do in CC3 or should I do this in something like GIMP? Any suggestions?

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