Hard Knuckle

Hard Knuckle (ハードナックル) 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
Known damage values in units for Mega Man 3.


 * 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.

Capacity
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

 * Mega Man 3: Top Man, Doc Robot (Metal Man, Crash Man and Wood Man), Yellow Devil MK-II, Hard Man (2nd Encounter), Wily Machine, Gamma (1st Form)
 * Mega Man II: Top Man, Quint
 * Mega Man: The Wily Wars: Buster Rod. G, Wily Machine (2nd Form)
 * Super Adventure Rockman: Top Man

Bosses immune to Hard Knuckle

 * Mega Man 3: Needle Man, Doc Robot (Flash Man), Gamma (2nd Form)
 * Mega Man II: Needle Man, Wily Machine

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, utilising 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.

Trivia

 * The Mega Arm is nearly identical to the Hard Knuckle in that both weapons fire Mega Man's fist.
 * All the Robot Masters in Mega Man 3 (Except Needle Man who is immune) take at least 2 units of damage when hit with the Hard Knucke.