The designer hated the charge shot — and players made it permanent.
Mega Man 4 introduced the charge shot: hold the button, release a bigger blast. Keiji Inafune, who designed the character, called it tasteless. He thought it made the Robot Master weapons — the whole point of the series — feel unnecessary. But Capcom kept it. Players kept it. Every Mega Man game after this one shipped with the charge shot built in. The designer's objection didn't matter. The player's choice did. Sometimes the thing you build survives not because it's perfect, but because the people who use it decide what stays.
— inspired by Keiji Inafune
About this game
Released in December 1991, Mega Man 4 introduced the charged Mega Buster shot — a feature that sparked debate within Capcom and became the series standard despite designer objections. The game's eight Robot Masters were chosen through a Japanese fan design contest, and the story expanded with a new antagonist, Dr. Cossack, whose daughter Kalinka becomes central to the plot's emotional twist.
The Story Behind
Released December 6, 1991 in Japan, Mega Man 4 was the first game in the series to introduce the charged Mega Buster shot. Directed by Hayato Kaji with Keiji Inafune as character designer, the game also featured Robot Masters chosen through a fan design contest in Japan — the eight winners each received a special golden cartridge edition.
Tricks & Tales
Keiji Inafune was openly critical of the charge shot feature, calling it 'tasteless' and arguing that it undermined the importance of acquiring Robot Master weapons. Despite his objections, the feature became standard in all subsequent Mega Man titles. The game's subtitle in Japan was 'Aratanaru Yabou!!' (A New Ambition!!), and composer Minae Fujii was credited under the pseudonym 'Ojalin.'
Collector's Guide
Region & Compatibility
Famicom and NES are the same hardware family but use physically incompatible cartridge formats — Famicom carts have a 60-pin connector and a narrower shell, while NES carts use a 72-pin connector with a wider housing. You cannot insert a Famicom cartridge into a North American NES slot without an adapter, and vice versa. The Famicom itself has no lockout chip, so any Famicom cartridge from Japan will run on a Famicom console regardless of origin. If you are buying a Japanese Famicom cart to play on a NES, you will need a 60-to-72-pin physical adapter; if you own a Famicom, Japanese-market software is your native format and no workarounds are needed.
Maintenance Tips
The gold-plated edge connectors on Famicom and NES cartridges pick up skin oils and oxidation over decades — a gentle wipe with a cotton swab dampened in 90% or higher isopropyl alcohol, stroking along the length of the pins rather than across them, is the accepted standard. Let the alcohol fully evaporate before reinserting. The old habit of blowing into a cartridge is folklore: the moisture in breath causes slow corrosion of the contacts over time, and any improvement you felt came from the act of re-seating the cart, not from the breath itself. Nintendo eventually updated its own troubleshooting guidance to say explicitly: do not blow into your Game Paks.
Going deeper
Explore the machine this game ran on, and what to check before you buy or care for one:
What to Watch Out For
Before buying, these are the points worth knowing — from someone who handles original Japanese Mega Man 4 copies regularly.
Does Mega Man 4 use a battery to save progress?
No — and that's actually good news. Mega Man 4 saves your progress with a password system instead of a battery, so there's no internal battery to die or need replacing. Write down the password the game gives you after each session, and you can return to exactly where you left off, even decades later. No battery means one less thing that can fail.
Before You Buy
Things worth knowing before you buy Mega Man 4
A short checklist for buying a used Famicom cartridge wisely — useful with any seller, anywhere.
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Choose a seller who tests it before shipping
A copy that has actually been powered on and checked is a known quantity. An untested one is a gamble you only settle after it arrives.
Look for a seller who states it was function-tested and says what they confirmed. A serious seller can tell you exactly what was checked.
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Make sure it fits your console
This is a Japanese Famicom cartridge with a 60-pin connector; a North American NES uses a 72-pin slot, so it will not fit directly.
Play it on a matching Japanese console or a region-free system, and confirm the listing states the region.
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If this title saves your progress, check the battery
Cartridges that save use a small coin-cell battery that fades over decades — a dead one wipes your save without warning.
Ask the seller whether the save function was tested. Replacing the battery is possible, but doing so erases any existing save.
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Check that the contacts are clean
Dirty edge contacts are the most common cause of startup and sound trouble in cartridges of this age.
Choose a seller who cleans the contacts before shipping. A note that it was tested and cleaned means the basics were handled.
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Confirm it is genuine, not a reproduction
Sought-after titles are targets for reproduction boards with replacement labels.
Ask for a photo of the circuit board and look for factory markings. Favour a shop with a licensed second-hand dealer permit (古物商) — by law its stock has a traceable origin, your simplest guard against fakes.
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Read the seller's reviews and return policy
A 100% positive record across thousands of sales is close to a guarantee — packing, communication and problem-solving all work for everyone. A return policy protects you if something is off.
Read the feedback and confirm a clear return window before you buy.
The last step before buying anywhere is knowing what it's worth.
See the unit we have →Unexpected Discoveries
Games you weren't looking for — but might be glad you found.
Rooms this game lives in
Wander deeper — explore the themed rooms where Mega Man 4 sits alongside its kin.
Memories from around the world
This is a young museum, and this page is still waiting for its first voices. The memories people send reach Taisei personally, and the ones that move him find a home here over time — always with the writer's blessing. Yours could be the very first for this game.
Share your memory ↑From the Museum's Screening Room
Mega Man 4 Nintendo Famicom Japan Tested Ntsc J — Max Explains