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Thanks!

Problem: I want to black / fog out sections of an image, and then be able to show specific sections again manually, one at a time. Details: I have an image of roleplaying game map, with rooms and corridors. My players will see the map on a TV, connected to a laptop running paint.net. I want to hide / fog out the rooms and corridors they have not visited yet. Then with hopefully one click show them the room when they enter it, while keeping the already seen/unseen rooms still visible/fogged out. The rooms / corridors are mostly different sizes and shapes. The map is already created, so I just need to know how to add removable "fog" in specific easily removable portions, or something similar, please.