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A couple of years ago, we played random maps with islands on a local Krasnoyarsk portal, and we probably played about 10 games. The impressions were positive. In my opinion, one of the advantages is that everyone has their own island, continent, and country. The variations with exchanging main heroes and treasures are interesting – the treasure island is a separate island, but it might be problematic to break out from the treasure island.
It would be interesting to play a tournament on maps with water where everyone has their own island.