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You're talking about complex maps?
I only play RPG maps, meaning single-player maps designed for completing the story, and in real-time, they take months to finish....
Hmm, by the way, I've already started writing a program that integrates saving into a map for editing and back again; I'll post it if it works=)))
Here's a simple example: you spend a couple of months in real-time completing a map, and near the end, a monster appears on a key cell. What do you do? Open the editor, create two empty cells for passage, and start over???