Challenge x1 is priority over completion. 646+, 5+ clears preferred. I don't mind helping people who are honest with me. Staying silent trying to fly under the radar won't get you an invite.
The game creator, crazychunkymonky, should send out invites 5-10 minutes before start time. If you don't receive invites, the creator may have left so start inviting each other through xbox/psn/pc on your own.
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