Mega Man 4: 2 Open Source Clones Compared

The Mega Man 4 (NES) Disassembly is a complete, 100% disassembly of the NTSC-U ROM that reassembles byte-for-byte using the xkas-plus assembler. mm4 is a separate disassembly of the US PRG0 release built for the NESASM assembler; its author describes it as extremely far along but not 100% complete, with documented gaps in the code that there are no plans to finish.

Comparison table

Mega Man 4 (NES) Disassembly

Availability

Status: Playable
Platforms: NES
Play in browser: No
Mobile: No

Project health

Development status: Halted
Last updated: 6y ago
Stars: 29
Contributors: 2

Compatibility

Requires original assets: YesRequires a clean ROM that assembles to match the original Mega Man 4 (NES) binary.

mm4

Availability

Status: Unplayable
Platforms: NES
Play in browser: No
Mobile: No

Project health

Development status: Halted
Last updated: 3y ago
Stars: 6
Contributors: 2

Compatibility

Requires original assets: —

Title	Mega Man 4 (NES) Disassembly	mm4
Status	Playable	Unplayable
Platforms	NES	NES
Play in browser	No	No
Mobile	No	No
Project health
Development status	Halted	Halted
Last updated	6y ago	3y ago
Stars	29	6
Contributors	2	2
Compatibility
Requires original assets	YesRequires a clean ROM that assembles to match the original Mega Man 4 (NES) binary.	—

Known limitations

mm4

completeness: Disassembly is extremely progressed but not 100% complete; some gaps remain in the code documentation.

Frequently asked questions

Are the Mega Man 4 clones on this page open source?

Yes — every clone catalogued here is an open-source project. Availability, license, and development-status details for each one are listed in the comparison table above.

Do I need to own the original Mega Man 4 to play these clones?

Mega Man 4 (NES) Disassembly requires original game assets to play.

See the full write-up for each clone, or go back to Mega Man 4.