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Boss Battle is an event in Bloons Card Storm introduced in version 4.0 that unlocks at level 3. In each event, the player can play matches against an AI-controlled Boss Bloon, who functions like an opposing Hero with a predetermined deck that can also be targeted and attacked by the player's Monkeys to deal damage, in addition to taking damage from the player's Bloons leaking. The boss cannot play its own Monkeys, only Bloons and Powers, but has several passive effects in addition to its own abilities and gains more as its health lowers. The player earns points for damaging the boss, and if they defeat it, they earn more points based on the number of turns it took. The player's score determines their placement on a leaderboard and contributes to the Global Score to unlock Global Milestone rewards for all players. Each boss has multiple stages with different abilities and decks, which changes based on the Global Score.
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