Video: https://www.youtube.com/watch?v=0H1y28GgjOs

RED = Zone offline.
BLUE = Zone active (adjacent to occupied, so zombies will spawn from here too).
GREEN = Zone occupied.
WHITE = Zone online but not active or occupied.

Download Files Here: www.alexromo.com/files/ZombieZoneDebugging.zip

Very helpful, thanks Sparky!