Walkthroughs for custom maps.

No one is trying to discredit the Horn of the Abyss project. HotA truly took Heroes to a new level, but that level, I'm afraid, no longer borders on SoD, for the simple reason that adjustments and innovations were introduced which killed the possibility of completing maps on the scale of Metataxer's Revenge, Xiedu, etc., etc. Furthermore, at the moment, there is absolutely no desire to create projects that are a priori subject to disposal with the release of another update. And by calling HotA not Heroes, I think Dendy meant the colossal gap in mechanics. It really is huge, which is why many perceive HotA as a different game. But no one here is trying to discredit Horn of the Abyss. Nor does this have any relation to the topic.

And there is another very important nuance here: HotA is NOT Heroes.
This game is undoubtedly popular. A fan addon, expansion, mod—let whoever call it whatever they want. It's a game similar to Heroes, but it is NOT Heroes 3.