This video is for you if:
- your zones seem to work only some of the times
- going into a zone triggers spawners in another zone
- IF YOU HAVE MORE THAN ONE ENTRANCE/EXIT TO A ROOM/ZONE
Here is a video describing more in-depth what it means for zone to be adjacent. It gets a little repetitive toward the end to be sure the adjacent zones are correct. If someone has stuff to add go ahead:
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Credits: I learned this from MakeCents but made a video tutorial