Hi @Mattia_
It's great to see you again!
There's a Big feature called achievements!Β
Β
Each every character have his own achievement and after you've complete all achievements for one character you will be getting a silver, gold and Rainbow look of the default skin of the character!
Unfortunately this feature is not came out for everyone yet including myself! It's only out for minimum of players so it could be coming to you and everyone in the future updates so stay tuned for it!
have a great weekend!
πππ¬π«
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