Boost Orb
Boost Orbs are items which can be equipped prior to battles in Kirby: Battle Royale. Up to three can be equipped at any one time, and they boost the abilities of their user in various ways. Boost Orbs will convey an effect upon their user either by simply being present, or by being activated during a round, depending on the type. To activate a 'Tap Activation' Orb, the unknown reader must tap the orb on the lower screen of the Nintendo 3DS during a round. By contrast, a 'Set Effect Type' Orb does not need to be tapped, and will apply its effect during the entire duration of the round.
In multi-round scenarios, Boost Orbs that are tapped will not be replaced, and they cannot be swapped out for different ones in-between rounds. Boost Orbs are also available in Dedede's Cake Royale, but only a few types can be used there, and they are not unlockable until the Platinum League. To unlock Boost Orbs in Battle Mode, Gold League must be reached in Dedede's Cake Royale.
There are several different types of Boost Orbs. They are as follows:
| Orb | Type | Description | Story Mode? | Notes |
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| Super Charge | Tap Activation | Widens charge-attack range and raises attack strength by 20% for 15 seconds. | 
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This is the only Boost Orb that doesn't need to be unlocked using Battle Coins. |
| Small Speed Boost | Set Effect Type | Increases movement speed by 10%. | 
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| Big Speed Boost | Tap Activation | Increases movement speed by 50% for 15 seconds. |
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| Quick Charge | Tap Activation | Halves charging time for 15 seconds. |
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| Maxim Tomato | Tap Activation | Recovers all health. |
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| Metal | Tap Activation | Protects you for 10 seconds, but you're heavier and less mobile. |
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This is one of two orbs that conveys a negative effect. |
| Small Attack Boost | Set Effect Type | Increases attack strength by 10%. |
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| Big Attack Boost | Tap Activation | Increases attack strength by 40% for 15 seconds. |
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| Quick Revive | Set Effect Type | Decreases the amount of time it takes to recover. |
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| Life Up | Set Effect Type | Raises maximum health by 40% |
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| Power Throw | Set Effect Type | Improves throwing ability. |
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| Big Air Bullet | Set Effect Type | Increases power and size of air bullets. |
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| Invisibility | Tap Activation | Makes you transparent for 15 seconds. |
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| Mega Blast | Set Effect Type | Will send foes you attack flying farther. |
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| Cashgrabber | Set Effect Type | Raises the number of things you can steal from foes by 50%. |
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| Deflector | Tap Activation | Brushes off attacks automatically for 60 seconds. |
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| Superspicy Curry | Tap Activation | Lets you blow flames for 10 seconds. |
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| Berserk | Tap Activation | Raises attack strength by 40% and mobility by 50%, but slowly drains health. |
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This is the other of two orbs that conveys a negative effect. The health drain effect cannot KO the user. |
