Zones:
During a run Risk of rain will rotate through 4 zones before looping back to the first.
As of today only the first two zones have more than one environment available to get, so the third and forth will always be the same.
Zone 1 envirnonments:
Distant Roost
Titatinc Plains
Zone 2 environments:
Abandoned Aqueduct
Wetland Aspect
Zone 3 environments:
Rallypoint Delta
Zone 4 environments:
Abyssal Depths