Playing with Mermaids is Depressing :((
Basically because of what they can do. They have abilities but most of the wonderful animations are on water.... base game worlds up to Pre-Island Living worlds (except evergreen harbor) has no Swimma...
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My guess the reason "They" EA and Maxis, don't put in swimable lakes or beaches in other worlds is because each pack is it's own entity. So putting it in other worlds would be extra programming code that people have to download even if they don't have the "Island Living" pack.
However, I do agree it would be nice.
