Talk:Home/@comment-829174-20110603174338/@comment-71.195.220.50-20110620073113

All of my NPCs live in a place I made out of green dungeon blocks. They wouldn't move in when the background wall was dungeon wall, but once that was replaced with the black "stone wall" that I made from harvested stone, they all moved in.

Thus, I think the key is in the material used for the background wall.