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For HoMM3:
1) Generate a map.
2) Open it in the editor and click on the "Tools > Map Specifications" menu.
3) Enter a "Map Name" to distinguish it from the others.
4) In the tab, check the box next to the hero "Jelu".
5) Start a new game with a random map.
6) In the map generation settings, click the button at the bottom "Show random maps".
7) In the list, select the edited map.
8) In your town, choose "Jelu" as the starting hero.