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My very first game was the standard campaign from Heroes 3. It seemed not too difficult to me, and the standard maps seemed even easier.
Before that, I occasionally played Heroes 2, and therefore I easily found new maps and campaigns. And the first campaign that truly opened up the "WORLD OF HEROES" for me was the Mahuuta campaign.
My skill level wasn't very high, and I spent almost the entire winter playing these campaigns whenever I had time. The author's concept, with complex maps and elements of humor, sometimes made it impossible to tear myself away from the game for days. Even after completing these campaigns, I still occasionally replay them to experience the pleasure of the classic Heroes 3 game again.
I downloaded almost all the maps and campaigns, but I didn't find anything even remotely similar. It's a pity that there aren't more campaigns like that :(