I need help first time on this website dont really know how it works

Nintendocor

So I'm kind of new to the game I played along time ago but I was just playing and I got 4 purple glowing keys if anyone could tell me what they do and how to use them and where to use them that would be greatly appreciated

SummonerNR

For Mutant Treasure Island (in Side Quests panel).

You earned keys from beating certain champs from this months special Objectives.
When you CLAIM each key, make sure to select a difficulty level for doing Treasure Island that you are strong enough to do (Level-1 on left of selection is easiest, Level-4 on right of selection screen is hardest).

See post below for info about what each of the 4 difficulties of Treasure Island look like (and what rewards are available on each path in them). You use a KEY (of the corresponding difficulty) to unlock paths on that Island quest and get rewards.

https://forums.playcontestofchampions.com/en/discussion/221058/mutant-treasure-island-full-maps-for-legendary-epic-master-heroic#latest