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Boss Battle is an event in Bloons Card Storm introduced in version 4.0. 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 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, but has several passive effects in addition to its own abilities, and it gains more as the player lowers its health. The player earns points for damaging the boss, and if they defeat it, they earn more points based on their speed. 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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