What happens if you and your friends are having a good time taking on an enemy base, and fighting the boss, but then some other players who are a higher level than you, just come along, blitz through all the enemies, then leave?
Would there be a way to set it to private and limit it to just your friends while you're there?
It would really suck if it happened.
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You apparently have the option of allowing people to join in your game. This includes both friends and random player so you could probably choose to only allow in one and not the other. Otherwise we don't know if there will be a system to only let in players near your level.