Firefly has The Jelly Farm on one floor, and The Jelly Farm II on a different floor. Each floor has levels from different Aurora Isles.
Every gate I've seen built in the arcade would have both on the same floor. I haven't seen a floor break/mix sets like this.
Is it safe to draw conclusions from Firefly, or should it be ignored and regarded as an "exception to the rules"?
Of course it's premade.