As of now every one would have heard of Brawl Stars a new game from Supercell.
One easiest way to get a new Rare Brawler i.e Barley is by just linking your supercell id.How to link your supercell id we've got you covered,just follow these steps:
1)Click on the upper right corner icon
2)On the second row there should be a icon named Supercell ID.
3)Log in to the account if you already registered before for COC or CR or register if you are new.
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From @zeref890