Walkthroughs for custom maps.

Yes, one very unobvious trick is required to be done :)

This means that those tiles on the map were empty, but due to a bug, clones of nearby objects started appearing on them: a sawmill and 2 towns. Here's the save file, the buggy tiles: 19,134,1, 20,130,1, 117,79,0. The bugs appeared after the main hero passed through those tiles, and there were events in those tiles. I've never seen such bugs before; they only appeared on that map and haven't appeared again since. Due to the uniqueness of the bug, I didn't bother anyone with questions: why this happened and how to avoid it. The only thing I noticed later was that, with SOD_SP enabled (specifically the version I have), a tile of the corresponding terrain is drawn on the locations of the tiles with events, but if the view of that location was blocked by another object, a "hole" appears in the object's image as a result (like the one behind the Rampart Amethyst in this save). If SOD_SP is disabled, everything is displayed as it should be.