Critical Boost (クリティカルアップ Kuritikaru Appu, lit. "Critical Up"), also dubbed as Critical Plus, is an ability that appears in Kingdom Hearts, Kingdom Hearts 358/2 Days, and Kingdom Hearts Re:coded. It boosts the user's ability to deal critical hits to enemies.
Mechanics
In Kingdom Hearts, Critical Plus is a combat ability that boosts the user's critical hit rate by a factor of 1+n, where n represents the number of Critical Plus abilities equipped. It costs 3 AP to equip (2 AP in Kingdom Hearts Final Mix).
In Kingdom Hearts 358/2 Days, Critical Boost is an equipment ability that allows the user to potentially deal critical hits with any kind of attack.
In Kingdom Hearts Re:coded, Critical Plus is an accessory ability that allows the user to deal more critical hits when their HP is reduced to 25%.
Learning Critical Boost
Kingdom Hearts
- Sora learns Critical Plus at levels 21, 69, and 90 with the Dream Rod; levels 48, 78, and 90 with the Dream Sword; and levels 51, 69, and 90 with the Dream Shield.
- Tarzan has Critical Plus as a default ability.
- Aladdin has Critical Plus as a default ability.
- Peter Pan has Critical Plus as a default ability.
- Beast has Critical Plus as a default ability.
Kingdom Hearts Final Mix
- Sora learns Critical Plus at levels 48 and 75 with the Dream Shield, levels 84 and 99 with the Dream Sword, and levels 96 and 100 with the Dream Rod; he also learns it after completing the Hercules Cup alone.
- Tarzan has Critical Plus as a default ability.
- Aladdin has Critical Plus as a default ability.
- Peter Pan has Critical Plus as a default ability.
- Beast has Critical Plus as a default ability.
Kingdom Hearts 358/2 Days
Weapons with Critical Boost
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 Duel Gear
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3 
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| Duel Gear+
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3
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3
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3
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3
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3
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| Duel Gear++
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3
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3
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3
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3
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 Phantom Gear
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3
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3
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| Phantom Gear+
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3
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3
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3
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| Phantom Gear++
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3
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3
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 Nimble Gear
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3
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3
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| Nimble Gear+
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3
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3
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 Ominous Gear
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3
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3
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3
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| Ominous Gear+
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3
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3
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3
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3
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 Prestige Gear
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3
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| Prestige Gear+
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3
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 Crisis Gear
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3
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3
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3
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| Crisis Gear+
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3
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3
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3
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| Omega Gear
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3
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3
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3
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| Omega Gear+
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3
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3
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 Hazard Gear
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3
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| Hazard Gear+
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3
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 Rage Gear
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3
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3
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| Rage Gear+
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3
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2
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3
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 Champion Gear
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3
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3
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3
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| Champion Gear+
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3
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3
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| Ultimate Gear
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2
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3
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3
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3
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| Ultimate Gear+
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3
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 Pandora's Gear
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2
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2
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| Pandora's Gear+
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2
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2
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 Zero Gear
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2
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2
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Rings with Critical Boost
Kingdom Hearts Re:coded
- The Strike Armlet has Critical Plus as its ability.