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Hard Knuckle (ハードナックル Hādo Nakkuru) is Hard Man's Special Weapon. When utilized, there is a short delay before the knuckle starts moving forward. It is somewhat slow, but has great strength. Mega Man can slightly guide the knuckle up or down once it is moving. It does moderate damage to Spark Man and Shadow Man. Hard Knuckle can also be used to break through Destructible Blocks in Mega Man 3 and Mega Man: The Wily Wars.

Damage Data Chart

Damage values in units in Mega Man 3.

Hardknuckleicon Hard Knuckle (HA)
Boss Damage
Needle Man 0
Magnet Man 2
Gemini Man 2
Hard Man 4
Top Man 7
Snake Man 2
Spark Man 2
Shadow Man 2
Doc Robot (Metal Man) 4
Doc Robot (Quick Man) 1
Doc Robot (Air Man) 2
Doc Robot (Crash Man) 7
Doc Robot (Flash Man) 0
Doc Robot (Bubble Man) 2
Doc Robot (Wood Man) 4
Doc Robot (Heat Man) 2
Break Man 0
Kamegoro Maker 3*
Yellow Devil MK-II 5
Holograph Mega Men 4
Wily Machine No. 3: 1st Phase 7
Wily Machine No. 3: 2nd Phase 7
Gamma: 1st Phase 4
Gamma: 2nd Phase 0
  • For Kamegoro Maker, a certain amount of damage will be taken from the health meter for each of the five Kamegoros produced, regardless of which weapon the player uses against them. Each Kamegoro has 3 health.


In Mega Man 3 and Mega Man II, one Hard Knuckle uses 2 weapon energy units. It can't be used if only one unit is left. With a full weapon energy gauge, it can be used 14 times in Mega Man 3 and 9 times in Mega Man II.

Bosses weak against Hard Knuckle

Bosses immune to Hard Knuckle

Other appearances

Super Smash Bros. for Nintendo 3DS / Wii U


Mega Man using Hard Knuckle against Greninja in Super Smash Bros. for Nintendo 3DS / Wii U.

The Hard Knuckle is used by Mega Man in the fighting game, Super Smash Bros. for Nintendo 3DS / Wii U, as his down air attack. Mega Man fires the Hard Knuckle directly below him. If the opponent gets hit by the attack from the sides, the move inflicts 12% damage and it is sent flying to the side they were hit. However, if the opponent gets hit by the bottom part of the attack, it inflicts 14% damage and functions like a Meteor Smash, knocking it in midair straight down upon contact. This can be deadly if an opponent finds itself in the air without a platform below it, as it can be sent straight down and get KO'd by the attack.

Other media

Mega Man uses Hard Knuckle in episode 25 of the Mega Man animated series. After defeating Hard Man by blowing him up from the inside with a Mega Buster shot, Mega Man copies the Hard Knuckle from him, utilizing it to knock Proto Man off a rock he was standing on to fire at the heroes.

It also appears in episode 32 of Captain N: The Game Master, where he uses the Hard Knuckle to defeat Top Man.



See Also

Mega Arm from Mega Man V