Keys

There are many different kinds of keys that can be used in Hidden City, there are keys to open doors, enter locations, mini-games, and to unlock treasuries.

Skeleton Keys
Skeleton Keys are special entry keys that allow players to enter specfic locations and without the number of keys required, the player isn't allowed to enter. It is quite easy to stock up on Skeleton Keys as many other locations have them as an item drop and there are a few boosts to help you gain more as you play.