Rewards
Water
Water 
is the main currency in the game. Its main use is to upgrade characters.
Pass XP
As you play the game, you will earn Pass XP (Experience). When you have earned enough Pass XP, certain rewards will be unlocked each level. The amount of Pass XP you have earned can be found on the Rewards Screen above the Premium Rewards.
Mastery Points
Mastery Points are used to increase a character's Mastery Level — in other words, how leveled-up they are.
Keys
Keys are used for unlocking new characters. Characters can be unlocked by spending Keys earned from the Bomber Pass and Trophy Rewards.
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