Buggy Balls are the explosive cannonballs favored by the pirate Buggy. A single shot can level an entire street, and over time Buggy developed shrunken versions, the marble-sized Muggy Balls, that pack the same destructive punch.
Buggy Balls are powerful munitions used by Buggy. The standard rounds are red cannonballs marked with his Jolly Roger on the face, and when fired they unleash huge, destructive blasts. Buggy boasted that these shells, working alongside his Bara Bara no Mi powers, would let his crew seize the Grand Line, though for all his arrogance he remained terrified of Whitebeard.
The blasts are devastating: one shell was enough to wipe out a whole row of buildings during the attack on Orange Town. The weapon is not foolproof, however, as Luffy bounced a third shot meant for him straight back with his Gomu Gomu no Fusen, blowing up the pub it had been launched from. Later, while locked up in Impel Down, Buggy revealed the Muggy Ball, a tiny variant roughly the size of a marble or bullet. Small enough to hide in a secret pocket, it keeps the full explosive force of the larger version, functioning much like a grenade. A still smaller non-canon offshoot, the Mini Buggy Ball, appears in a video game wielded by a member of the Set Sail Pirates.
Buggy invented and relied on all versions of the ammunition. He first deployed the standard balls against Orange Town, then used a Muggy Ball in Impel Down against the Jailer Beast Minotaurus, kicking it from the tip of his shoe to badly wound the creature. He also tried a Muggy Ball on Dracule Mihawk, only for the swordsman to deflect it right back at him.

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Buggy Balls are explosive cannonballs invented by the pirate Buggy, marked with his Jolly Roger and capable of devastating blasts. Buggy also created the smaller Muggy Ball, a marble-sized version with the same destructive force.
A single Buggy Ball is powerful enough to level an entire row of buildings, as shown when Buggy wiped out part of Orange Town with one shot.
A Muggy Ball is a tiny, marble-sized variant of the Buggy Ball, small enough to hide in a secret pocket, that keeps the same explosive force and functions much like a grenade.
Yes. Luffy once bounced a Buggy Ball back at him with his Gomu Gomu no Fusen, blowing up the pub it had been fired from, and Dracule Mihawk later deflected a Muggy Ball straight back at Buggy.
In Impel Down, Buggy kicked a Muggy Ball from the tip of his shoe to badly wound the Jailer Beast Minotaurus.
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