Talk:Hidden City Info/@comment-43293313-20190807211631/@comment-34917098-20190807215322

That are locations which your friend has marked as his favourite, or has a quest for. When you visit them you help your friend with your bonus items: less use of energy, more coins, greater chance to find an item. It's a rather new feature, it started two events ago, and it did not worked properly, but with every new update G5 changes something.

There is a comment somewhere on the wiki. When you read the wiki activity no doubt you find your answers. You've to read and scroll a lot down, because of the many comments on this new event :), but I'm sure you can find many answers and comments there. Advise: write your questions on the Event-location-page, that's the one which almost everyone reads first.

But I hope my answer did help a bit

Enjoy the game!