Alan
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The map should be available to both players, so share it with the second player before the game. Also, isn't this a custom random map generator? The problem might be related to that.
When creating maps in the native RMG and playing them immediately, everything works fine. But if you open the map in the editor, it's considered modified, and you'll have to share it with anyone who wants to play with you.
Тьма - это то, что позволяет смертным не забывать, как ярок бывает свет.