PLEASE READ THIS DESCRIPTION CAREFULLY AS THIS IS THE ONLY ROM HACK PATCH THAT I WILL EVER SHARE ON ROM HACK PLAZA WITH SERIOUS BUGS THAT HINDER GAME PLAY.

Sonic Megamix v3.5 Is a leaked build of Sonic Megamix bridged between the famous 3.0 on the Mega Drive/Genesis and the later 4.0 on the Mega-CD/SEGA-CD that has been circulating in the community for a very long time and has managed to keep a very low existence on the net until I released a Youtube video of it in January 2023. Not long after I uploaded a video of it, a wave of other content creators rushed to put out their own video of the build (Razor/Zenon, AmyRose Playthroughs, Jaypin88) and many others. It didn’t originate with me, I got the build from another Youtuber who had a video of it before me uploaded many years earlier, by accident I seemed to have got the ball rolling so to speak and made the information reach a wider audience through my video.

About The Build And My Original Description On It From 2023:

This is a leaked build of Sonic 1 Megamix (no not 5.0a) this one is known as 3.5 and is bridged between the famous Mega Drive/Genesis build 3.0 in 2007 (this is the one you can buy on a reproduction cartridge for merely nothing these days) and 4.0 2008 (the Mega-CD/SEGA-CD build) which saw some major overhauls start to appear in the game. 3.5 is less buggy and glitchy than 4.0 on the CD attachment and doesn’t have nearly as many of 4.0’s bugs but it does have a few of it’s own, most notably an improper colour palette glitch which makes the graphics look like you’re trying to play a Game Gear ROM on the Mega Drive/Genesis or Master System with a limited colour palette. This bug is currently 80% removed by adding in 6 game genie/pro action replay codes patched to the ROM.

This ROM is also very similar to 4.0 on the Mega-CD attachment and shares almost identical data to that one but the key difference being that this one plays on the SEGA Mega Drive/Genesis console in cartridge form, this also means no loading times to put up with and still able to enjoy all the same features as 4.0 such as playing as Tails and Knuckles and on an Everdrive being able to snap/save state your gameplay and come back to it at a later time which I think is awesome. The game genie/pro action replay codes posted below don’t apply to playing this ROM hack on the Analogue Mega SG. These codes as far as I know are only for the original SEGA Mega Drive/Genesis model 1 hardware. Mega SG and Kega Fusion emulator play this hack flawlessly, but real hardware has a few questions it wants to ask this ROM in order to get it to co-operate.

NOTES: 

1. This build of this game has a colour palette and dark contrast issue that makes the game unplayable, to fix this I have found some game genie codes that can be put in to correct the palette and lighten the picture quality.

GAME GENIE/PRO ACTION REPLAY CODES:

ATKA-ABGC 0012C2: 8004 = Fixes zone art colours

AVKA-ABCC 005242: 8004 = Fixes zone art colours

AVSA-ABFG 005EA6: 8004 = Fixes zone art colours

AJBT-AA34 00033A: 6002 = Disables the checksum

ATKT-ABBE 001324: 8004 = Fixes special stage/splash screen colours

ATKT-ABBG 001326 8004 = Fixes special stage/splash screen colours

Only the 4 water levels remain with horrible colour as I cannot find a fix for them as of yet.

2. This colour palette bug makes the game unplayable or playable depending on what hardware or emulator you’re using to run the game off.

What It Works On: 

Analogue Mega SG,

Kega Fusion Emulator

Everything else I haven’t found it to work on. I play it myself on my Analogue Mega SG using a flash cart and there are no problems, so it’s safe to assume that all FPGA devices and most software Emulators will run the game perfectly.

What It Doesn’t Work On Unless Those Game Genie Cheats Are Put In: 

Original Sega Mega Drive model 1 and original Sega Genesis model 1

Regen Emulator

Haven’t tested a model 2 Mega Drive/Genesis console as of yet.

3. The Save/Load feature on the title screen is broken and doesn’t save gameplay, infact it crashes the game if you pick Save so pick No Save.

4. All characters from the Mega-CD 4.0 version are here with their signature special moves.

5. Music is optimised for PAL 50Hz playback unlike v3.0.

6. Aside from the colour palette bug and the save feature not working, all the bugs introduced in v4.0 on the Mega-CD are not here.

7. In the Special Stages, sometimes your character will get stuck in the blocks and bumpers, jumping continuously will eventually pry your character free from their trapped spot.

8. My video down below helps explain about this mysterious leaked build in greater detail.

9. Finally it will be archived here for history preservation and will no longer remain roaming around in the internet wilderness.

INSTRUCTIONS: 

Inside the ZIP file you’ll find the actual IPS file, it is in Lunar IPS format and must be patched to the ordinary Sonic 1 ROM (USA/European), the checksum is fixed but if you encounter the colour palette glitch, you’ll need to put in those game genie codes to correct it, this also means disabling the checksum (which game still functions correctly without it).

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