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doktorpetrov, are you by any chance related to medstrax?
Added 21 minutes later
Actually, Prospektor isn't even necessary; everything can be found in the editor, and anything that's unclear can be checked in the save file. People played and achieved excellent results even before Prospektor, but it's easy to get used to good things.
In general, to complete such a map in such a short time, you need to do a huge amount of work.
by the way, the "portal to the city" is included as an event on the map and is given before entering the Dragon Castle.