Mizrael
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It's much simpler – a server is set up, and players connect to it via remote terminal. The game is installed on the server, and the saves are stored there as well. The player has all access rights to the files restricted, so they can't obtain these saves. That's it; it's impossible to tamper with the map. However, throughout the history of hockey... oops, I mean, Heroes :D, no one has ever done something like this.
