So it turns out that I misunderstood the system a little bit. It's based on the level of the first player that enters the map and then anyone that's 5 levels below or above that player can join. That's feels a bit loose to me, so I'm going to change it to only allow players 3 levels lower or higher than the first player to enter. That way at least the lowest a level 20 player will get to play with is 14, not 10.
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