Virtual Table: Whispering Cairn Map

Here's what I've been able to do thus far in copying the map from The Whispering Cairn. There aren't a lot of tiles to work with, but the ability to block off parts of the map and drop notes for them to see is neat. I'd like to see a function that allows you to attach skill modifiers to elements that players automatically notice if their modifier is high enough.

For example, I find myself dropping hidden notes for myself, but it would be better if I could place a note that characters with a high enough Passive Perception score detect automatically. There's some tracks that they could identify with a high enough Nature skill, so having the note display to players with a high enough "passive" Nature would be cool.