Cycling What do the tiers mean?

[rachel7d]

Can anyone explain to me what the different tiers of villagers mean? What's the distinction between them? Are some more valuable than others? And how do you know which tier a villager is?

 

[ElysiaCrossing]

I'm sure the list of villager popularity thread can help you figure this out.

if you still don't get it, post in the acnl thread.