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I found a map that, when played at 200% difficulty, seems more hardcore than any of Sizzon's or Nautilus's works :D
The map is Polish, called Limes Inferior, by the author Sprocket, size L. Victory condition: deliver the artifact to a town. Defeat condition: fail to do so within 12 months.
We start without a Castle, with a level 1 hero specializing in defense against a one-sided monolith (essentially, the army consists of 1 unupgraded Gorgon). Nearby are several seer huts, providing bonuses for resources and gold. Thus, the difficulty we choose directly affects what we will be playing with. Also, three bonuses are available to choose from, regardless of the difficulty:
1) basic log + rider's gloves;
2) +8 attack;
3) 10 unupgraded Gorgons.
In general, starting at the usual 200% difficulty, I took the log with gloves, grabbed the Admiral's hat, and barely managed to capture the nearest town. Then things got really interesting: there's nothing in the Castle, resources nearby are in small quantities and heavily guarded, and nothing is lying around for free. I built a tavern, and after a couple of days, I gathered enough money to buy out a hero with a ballista and used it as a tank, as best I could, dealing with 1 Cow and a couple of flies against guards like 11 Ogres or 11 Great Basilisks (I also built a forge and bought a tent, so the Cow could survive). On the third week, there was an epic battle for a stash of Rukh, which I bought by spending all the money I had. Somewhere around this time, I managed to build a fort, and on the 4th week, an enemy Swamp hero came and crushed me without a chance (a single Ice Bolt was enough).
Interestingly, all secondary skills that grant magic are banned on this map, and guilds in the available Castles are no higher than level 3, meaning we're dealing with a map where even wisdom is practically useless.
Maybe I'll try starting with other bonuses at 200% difficulty, but it's almost funny to play this way. I also recommend checking out the anti-magic garrisons of the Necropolis in the editor, which are mandatory to break through, and trying to figure out what they can be broken with.
Link to the map:
http://www.heroes3.eu/download/mapy/72-limes-inferior