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Recent Updates

Sonic 1 Megamix

Hack of Sonic the Hedgehog


Highlights for version 3.0:

  • All level layouts edited (some complete; others pending).
  • Each character now has a unique set of moves (though Sonic and Shadow share the homing attack).
  • Most levels (not all) have a small intro, ala S3K, where they perform some sort of action when starting the level i.e, running in from the left.
  • Loads of music edits.
  • There is now a “preferences” screen, where you can customize certain aspects of the game (suggestions are welcome).
  • Cheat codes have been changed - figuring them out will grant you access to a new, special level select (which is a bit buggy - just don’t hit left/right on zone selections =P).
  • “Original Mode” allows you to play the original levels from Sonic the Hedgehog, using all of the additions from Sonic Megamix (such as bug fixes, moves, preferences, etc). There is also a separate save slot for a character’s original mode.
  • Title screen demos have been edited. Credits demos have not.
  • Super forms have been added.
  • Elemental shields, ala S3K, have been added.
  • Credits have been edited; each character has a unique end pose on the ending sequence.
  • Various other changes. See the Wiki page for more info.

This is considered a “complete” release, although not “final”. It was succeeded by an incomplete “4.0b”, which was ported to SegaCD, and further changes have been implemented since, although a “final” release and its date are tentative. More information can be found on the Manual/Wiki page, located at here:

For a complete list of authors, please see:

Note: Apply xdelta patch to US Genesis Sonic 1 ROM. The patch is in xdelta format due to shifted data which resulted in a IPS patch almost the same size as the patched ROM.

ROM / ISO Information:

  • S1MMU.7z
  • Database: No-Intro: Genesis (v. 20180824-045026)
  • SHA-1: FC4800C1D8A09F375ED8409F2E116F09FB67206B
  • CRC32: 9F724847




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User Review Information

Lots to Explore!

Reviewed By: Mother Kojiro on 20 Dec 2021

This hack starts off great with the beautiful Sunset Hill Zone, and while Misty Maze was the only other zone that blew me away aesthetically, it’s still quite a hook. You’ll hear music from all over the Sonic franchise, including a few from the criminally overlooked Sonic 3D Blast OST. You have your choice of 3 playable characters: Sonic with his homing dash, Shadow with his double jump, and Mighty the Armadillo with the ability to stack different types of shields. All 4 shield types from the 2D Sonic titles are here, and they work just as they did in their original games, including the ability to deflect projectiles. The level design is pretty good overall; you get lots of rings, so you’ll have plenty of opportunities to challenge the devious, yet interesting special stages. Misty Maze Zone, however, has a LOT of cheap hits; almost every single one of those drill robots will blast you out of nowhere, and I don’t ever remember being hit by a single one of them in the original game. Overall, though, it’s definitely worth playing; I’d recommend either this version or 1.0.

Version 3.0 Recommended - Yes

User Reviews
Lots to Explore!Mother Kojiro20 Dec 20213.0Yes
Global modification of other yearsdiablo66630 Jun 20223.0Yes
Biggest Sonic hack everMathUser292907 Jun 20163.0Yes