Dirty_Player
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Okay, here's the deal. I don't entirely like the idea, because it's not what we should be teaching new players.
But, in general, we can do it this way. When there are no more restarts. Load a single-player game, open the map, and load it again for two players. This is the least harmful option, in my opinion.
I don't know how to open a map in multiplayer, and even if I did, I wouldn't say it, because there's no need to teach everyone how to cheat.