HoMM3 HD is a mod (add-on) for the game Heroes of Might and Magic 3.

This is clearly a bug in the game, and the error in the code logic is very evident. Basically, neutral zones are -1, which indicates the end of the table, while extra castle zones are 0, which are empty spaces after the end of the table.

I understand that the question primarily concerns neutral dwellings, Pandorians, and Seers, right? They really shouldn't appear according to the original idea; they are the result of a bug.

I have code that, in addition to fixing the bug, makes it so that, regardless of the terrain, a zone without a city becomes neutral with a certain probability. If baratorch deems it necessary, he can include it in HD.

By the way, it would be interesting to know how multiplayer players generally feel about neutral zones. So far, I only see that since the release of that version, no one has paid attention to their absence. :)