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This is a list of enemies, hazards, and bosses that appear in Mega Man III. Names between parentheses are different names from the game ending. Unofficial names are in quotation marks.
Please note this is a list for the Game Boy game, not the NES.
Description/background information of an enemy or boss.
Health Points:
Lists the amount of health an enemy has based on the amount of hits it takes from uncharged Mega Buster shots. Most bosses with a health meter will always have an HP value of 19.
Attack Damage:
Attack damage Mega Man takes in bars of health from his life meter.
Special Weapon:
The Special Weapon that Mega Man can receive after defeating a Robot Master.
Weakness:
The Weapon that will cause the most damage against a boss in units. For enemies, it will be the Weapon that takes the least amount of shots to destroy.
Bubukan MK-II is a variant of Bubukan that appears in Snake Man's stage. They do not have a pole, but the upper part of their body can jump over Mega Man.
A Gabyoall that is completely invulnerable to all weapons, and it now has a companion on the ceiling that will make an electric wall together occasionally.
A skeleton-themed Sniper Joe that lobs bones at Mega Man. It will die from one hit of anything, but it will put itself back together unless certain weapons are used or its fired at enough times.
A larger version of the Petit Snakey that fires large energy balls at Mega Man while its "body" wriggles around making a shaky surface for Mega Man if he's on it.
A large Adhering Suzy that will travel along the room in varying patterns and slams into walls and makes minor earthquakes and can either make small hops on the ground or make large hops along the ceiling to hit Mega Man. It will act as a boss in the first part of Wily's Castle and later be used as a sub-boss in the Wily Station.
A large whale sub boss that fires missiles at Mega Man. It can also try to inhale Mega Man to make him hit the spikes below Moby. When it inhales, small spikes also rain down on Mega Man.
A Robot Master made by Dr. Light and Wily. He can create a clone of himself that will travel around the room with him, or he can fire his Gemini Laser that will bounce around the room.
A Robot Master made for charging equipment with his electricity. He can either fire several small Spark Shocks all around the room, or he can charge one up and fire a large Spark Shock directly at Mega Man.
A Robot Master found by Dr. Wily, supposedly from an ancient extraterrestrial civilization. He can fire his Shadow Blades into Mega Man, or he can slide into Mega Man.
A Robot Master built by Dr. Cossack to dig in construction sites. He can drill down and resurface underneath Mega Man or charge towards Mega Man and fire Drill Bombs at him.
A Robot Master built by Dr. Cossack for sanitation. He can try to inhale Mega Man with his vacuum, or he can use the parts he collected from him inhaling and spit them back out as a Dust Crusher.
A Robot Master built by Dr. Cossack with the AI functions of a submarine. He can torpedo towards Mega Man, or he can fire 2 Dive Missiles which will home in on Mega Man.
A Robot Master built by Dr. Cossack to specifically hunt Mega Man. He can fire his buster at Mega Man or he can charge towards Mega Man and use his Skull Barrier.
The second in the line of the Mega Man Killers based off the music punk. He will jump several times, throwing a Screw Crusher directly at Mega Man every time he jumps. He will then make a few short hops in his ball form before shooting towards the other side of the room, and that charge can occur at different altitudes.
A new version of the Wily Machine that tries to stomp on Mega Man. It will hover for a few brief seconds before slamming down onto Mega Man, and every time it slams down it fires off two missiles that will home in on Mega Man. The weak point is the eyes.
A damaged version of the Wily Machine with the cockpit exposed and now it can't move at all. All he can do now is fire balls out of his side cannons at Mega Man, but the catch is that Mega Man can't fire at him with anything but the Screw Crusher thanks to his position.