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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




ContributorType of contributionListed credit

User Review Information

Global modification of other years

Reviewed By: diablo666 on 30 Jun 2022

When I got acquainted with games about Sonic the Hedgehog, I got this copy in the list. (I used to THINK of all HACKS as OTHER GAMES, but I was a naive fool)

How did this hack catch on and why do I have it in my Collection of good hacks?

1. Competently made levels. They don’t disappoint. Maybe some had to pass for 8-9 minutes, but, honestly, for a beginner - this is normal. Now I pass faster, because I have studied them better

2. Abundance of music. This is the moment I will touch exactly. For EACH ACT has its own music. In those days - how could SFactor boast of this? Although this is from other games, but they are completely suitable for both levels and the boss.

3. Characters. Each character has their own abilities… And not just “Sprite” and behavior like the ” original Sprite”

4. The Special Stages. Much more complicated, much more complicated, and much more cunning. Hooked? OH YES.

5. Secret features of the hack. If you pass the perfect hack, you will open a secret mode with 1 life and tricky “monitors”. This mode for opening-requires:

  • a) a Good ending for any character without death
  • b) Play only with saving
  • C)Training. (For this is a special HARD MOD)
  • 6. Customizing the hack to suit your needs. You want this? Put it on!

    7. Although not completely, but the classic mode. Rather, “Sonic ТНЕ Hedgehog 1, but the ability of the hack”

    I definitely say “Yes”, because even at this time - the hack does not lose its relevance (and for this hack - motivators make mods for “sonic Mania”, but this is another story).

    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