Overview[1]
Keys are a form of currency used to purchase boxes inside the Shop. They were introduced during the Christmas Event 2017. Mystery Key is the only defualt key in the game, and can be purchased in the shop for 125 Diamonds, and traded. There are also other keys—Skeleton Key 2018, Snow Key, Vampire Key —that can only be obtained through events. They served their same respective purposes, albeit for their respective event box instead. They do not work outside of events.
