Xaart
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Yes, some players completed it, with some even using only Elves for certain parts (I found a screenshot in the corresponding thread on http://heroescommunity.com). I myself completed it quite a while ago, about five years ago. But the map stood out because, up until then, I hadn't encountered such challenging scenarios.
If I remember correctly, in the first week, you need to find a secret path to the castle in the swamps. That moment also confused me at first).
It's too difficult for me:(. I tried Wayfare, and I also couldn't manage to take the castle within 7 days. I'll keep trying, maybe I'll get lucky).