Keys are a currency in Brawl Stars that can be earned by participating in any game mode. They are also awarded whenever a new event opens. Keys are used to open Brawl Boxes. Key Doublers can be bought in the Shop with Gems to double the amount of Keys earned from playing matches.
- 10 Keys are awarded upon tapping on an Event Slot when a new Event has come into rotation.
- Keys are awarded upon completion of a Brawl Event up to a limit. The amount depends on the player's performance during the match.
- 10 Keys are awarded each time a Brawler gains a rank.
- 20 Keys are awarded each time the player gains an experience level.
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You can buy key doublers from the shop to increase the amount of Keys earned while playing. This booster costs 50 Gems and doubles the next 1,000 Keys received at the end of any match. Key Doublers can also be found occasionally in Brawl Boxes.