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I downloaded Tapani's RMG generator, a map generator for Heroes 5. It's a fantastic tool and far superior to the built-in one in Heroes. It can generate maps of all sizes, and before generating, you can set parameters such as monster strength, resource richness (number of mines), Dragon Uprising protection, and, what's great, map mirroring with the opponent (you each have a Castle nearby, with the same types and strength of monsters, wells, arenas, etc.). This means that the structures on your side and your opponent's side will be identical, but the terrain will be different – mountains, trees, etc. You can also set it so that everything is different. :)
BUT THE MOST IMPORTANT thing, and what I like most about this generator, is that there's only one path between you and your opponent (it's like a winding snake). This means that the opponent can't flank you, although some strategists might not like that, but it's perfect for me. I've leveled up heroes to level 34-35 on these maps by fighting monsters (without trees; with trees, I reached level 40, but there was only one such map). I collected artifact sets, etc. I play on Hero difficulty, but by the 10th month, for example, such large groups of monsters appear that it becomes quite difficult to pass, for example, 5,000 Isabel knights when you only have 130-160 titans in your army. But you can always find a solution to pass them without losses, which is why I love these maps so much. :) :) :)