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In Mega Man 4, Dr. Wily is declared as having been killed by the explosion of Gamma. A year passes and Rock, Roll, and Dr. Light are living in peace. But soon, the peace is broken by a new threat.

A supposed colleague of Dr. Light's, the mysterious Dr. Cossack, has sent out eight of his own Robot Masters to find Mega Man, whom Cossack blames for the kidnapping of his daughter. Mega Man, hoping to clear his name, sets out to find Dr. Cossack, this time armed with a powerful new weapon: the Mega Buster. Mega Man must now battle with Cossack's fiendish Robot Masters and find Cossack's daughter before it's too late.

Gameplay-wise, this installment is similar to the previous game in the series. Like before, Mega Man has to complete eight stages, defeating their robotic bosses and acquiring their weapons as a reward. He retains his abilities to jump, shoot, climb, and slide. His dog can be transformed to access different area types. A new addition is the Mega Buster weapon, which can be charged to produce powerful shots.


Mega Man 4 NES Dr. Wily is gone, but a new evil has come to take his place
Mega Man 4 NES Japanese title screen
Mega Man 4 NES Toad Man's stage
Mega Man 4 NES Drill Man's stage

Promo Images

Mega Man 4 Screenshot
Mega Man 4 Screenshot
Mega Man 4 Screenshot
Mega Man 4 Screenshot

Alternate Titles

  • "Rockman Complete Works: Rockman 4: An Evil New Ambition!!" -- Japanese title
  • "Mega Man IV" -- In-game title
  • "ロックマン 4 新たなる野望!!" -- Japanese spelling

Part of the Following Groups

User Reviews

Harder isn't always better NES Bregalad (968)
A solid follow-up NES Jonathan Hollas (25)
Fairly good, but could have been better. NES David Bryan (25)

Critic Reviews

GamePro (US) NES Dec, 1991 5 out of 5 100 NES Mar, 2009 8.5 out of 10 85
Random Access NES 2005 8.4 out of 10 84
PGNx Media NES Jan 03, 2003 8.25 out of 10 82
Nintendo Magazine System UK NES Jul, 1993 81 out of 100 81
Electronic Gaming Monthly (EGM) NES Feb, 1992 32 out of 40 80
Ultimate Nintendo: Guide to the NES Library NES 2016 4 Stars4 Stars4 Stars4 Stars4 Stars 80
HonestGamers NES 1998 8 out of 10 80
Total! (Germany) NES Apr, 1994 2.25 out of 6 75
The Video Game Critic NES Jul 27, 2002 B- 67


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The "antagonist" of Rockman 4, Dr. Cossack, makes a guest appearance in Rockman 8. But wait! Before you go screaming about "I already beat that game! Where is he!?", he doesn't appear in the game, but in a manga series BASED on Rockman 8 that was released in Japan! Cossack's daughter, Kallinka, also makes a quick appearance in the manga.

Golden cartridges

During production Capcom held a competition to design a boss monster for Rockman 4. From 70.000 entries, eight winners were selected. Those winners were not only rewarded with their bosses in-game, but also sent a golden cartridge of the game. This cartridge colour was not reproduced, so most likely only eight modules in that colour exist.

Manga adaption

In Japan, a doujinshi manga (fan-created manga) of Rockman 4 is available. It follows the game's plot more or less straight through, but it's missing two boss encounters from the game: one from Cossack's citadel (the Wall Walkers), and one from Wily's castle. The manga was published by the manga label BomBom, and it's a rather rare find.
Contributed to by ResidentHazard (3566), Lain Crowley (6787), Michael Cassidy (21009), Sciere (529433), Kabushi (215724) and Satoshi Kunsai (2084)