makshaker
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Dear Marmot, thank you for trying to help. Before writing here, I contacted the author, and he sent me the campaign versions he had, but they are even older than the one on Heroespedia, and the way to complete the 4th map without destroying Mutari is not implemented there. That's why I wrote here – maybe someone has encountered a newer version where there is a second way to complete the 4th map.