SONIC DELTA 40Mb (Sonic Delta Next)

By Neto

This hack is a junction of all classic MD Sonic (Sonic 1. 2, 3 and Knuckles ) in to a single game. The games run over Sonic & Knuckles engine and use two custom sound drivers derived from S2B and SK sound drivers to manage all musics and effects.

This hack as title said has 40 Megabits of capacity, and was coded following SEGA Standards for games larger than 32Mb which require banking switch scheme to access extra data ( Flat coding is more easy, but the game will not work on all hardwares, especially with systems equiped with SEGA CD ). Since this hack uses banking switch scheme, with proper cartrige hardware you can run in all consoles without any conflict.

The Game can run in an ATGames Firecore console equiped with SDCard, but save feature will only work if you run the game through "Neto MD-DOS 1.10 or higher" in that console. ( )

The game has approximately 37 Levels, The number can be less, depending of the character chosen..

The Level Order is:

  • Green Hill (Sonic 1)
  • Marble (Sonic 1)
  • Spring Yard (Sonic 1)
  • Labyrinth (Sonic 1)
  • Star Light (Sonic 1)
  • Scrap Brain (Sonic 1)
  • Final (Sonic 1)
  • Emerald Hill (Sonic 2 Alpha)
  • Winter Hill (Sonic Triple Trouble Robotnik Winter Port)
  • Wood ( Sonic 2 Beta )
  • Sand Shower ( Custom Level )
  • Chemical Plant ( Sonic 2 Beta )
  • Neo Green Hill ( Sonic 2 Beta )
  • Casino Night ( Sonic 2 Beta )
  • Hill Top ( Sonic 2 Alpha )
  • Dust Hill ( Sonic 2 Beta )
  • Hidden Palace ( Sonic 2 Beta )
  • Oil Ocean ( Sonic 2 Beta )
  • Metropolis ( Sonic 2 Beta )
  • Genocide City ( Sonic 2 Alpha )
  • Sky Chase ( Sonic 2 )
  • Sky Fortress ( Sonic 2 )
  • Death Egg ( Sonic 2 )
  • Angel Island ( Sonic 3 )
  • Hidrocity ( Sonic 3 )
  • Marble Garden ( Sonic 3 )
  • Carnival Night ( Sonic 3 )
  • Icecap ( Sonic 3 )
  • Launch Base ( Sonic 3 )
  • Mushroom Valley ( Sonic & Knuckles )
  • Flying Battery ( Sonic & Knuckles )
  • Sandopolis ( Sonic & Knuckles )
  • Lava Reef ( Sonic & Knuckles )
  • Hidden Palace ( Sonic & Knuckles )
  • Sky Sanctuary ( Sonic & Knuckles )
  • Death Egg ( Sonic & Knuckles )
  • The Doomsday ( Sonic & Knuckles )

Nine Bonus Stages (six Sonic 1 Special Stages as Bonus Stage) which can be accessed by touching a lamppost with 20 or more rings. The formula for selecting which Bonus Stage will be played is "RING" count divided by 4 and the remmainder of operation will give the stage to be played:

  • 0 - Slot Machine;
  • 1 - Glowing Spheres;
  • 2 - Gumball Machine;
  • 3 - Sonic 1 Special Stage.:

You can play as:

  • Sonic and Miles;
  • Sonic Alone;
  • Miles Alone;
  • Knuckles and Miles;
  • Knuckles Alone.

All Characteres have Super and Hyper Forms. For Miles the Super Form has no flickies. In Sonic 1 and Sonic 2 part you will play Sonic 2 Special Stages through big ring (50 rings or more is required ) at end of levels. After Knuckles steal your emeralds in Angel Island you need to get all Emeralds again, now through S3 Special Stages.


  • Debug object list works for all levels;
  • Demo mode edited to show some Sonic 1 and Sonic 2 Levels;
  • Options menu where you can personalize some sound tracks.


If you are running debug mode to test, when Sonic is an object, hold "A" then press "C" to backwards the objects list. You can select the Egg Prison to skip that level.

The Perfect Bonus in the Sonic 2 Special Stage is given if you do not hit any bombs and complete the stage (You must protect Miles too in the cooperative mode).

If you use Save State in emulators for Sonic 1 and Sonic 2 levels probably the game will crash after the Save State is loaded. This occur because emulators does not save the SEGA Mapper state. To get the Save State working just start a New "No SAVE GAME" and after the Green Hill is loaded you can load the Save Sate.

Special Thanks:

  • The Taxman - Sand Shower Art;
  • Master Emerald - Extra Art in Sonic 2 Beta Title Screen.
  • Chron D" (Discord) - Robotnik Winter Music
  • Volbby (Discord) - Number "3" art in title cards
  • Nineko - Bridge Music, Sand Shower Transistion Music and other 8 bits converted Music
  • Meta (Discord) - Yellow Desert Music

Tools Used:

  • Neto Assembler Editor IDE;
  • Sound Port from Neto Assembler Editor;

Levels layout edited with "Sonic Series Level Layout Editor" from "Neto Assembler Editor";

z80 to Asm used in musics (Tool not realeased to public) ;

z80 code (Sound Driver) built using Neto Assembler Editor buit in compiler;

M68K code built using Neto Assembler Editor with Snasm68K compiler;

  • The Taxman - Sand Shower Art;
  • Master Emerald - Extra Art in Sonic 2 Beta Title Screen.
  • Chron D" (Discord) - Robotnik Winter Music
  • Volbby (Discord) - Number "3" art in title cards
  • Nineko - Bridge Music, Sand Shower Transistion Music and other 8 bits converted Music
  • Meta (Discord) - Yellow Desert Music

File Type: rom/rar

File Size: 3.03 MB

dilworks @ 2023-10-23 18:47:23

Oh man, Sonic Delta!

"Neto's my name, consistency's my game!"

A hack as old as SHC itself (20+ years! That's slightly over half of my life!), and yet it keeps getting better, more polished, more refined, like the job of a lifetime. The ultimate vanilla Gen/MD Sonic experience, if you will, but with extra icing on the cake.

THIS is what Sonic Origins should have been - not the rushed disaster we got where even bridges were burned :/

campbellsonic @ 2023-10-23 20:49:34

Level select is 1, 9, 9, 1, 0, 6, 2, 3 in the sound test, you're welcome

Jdpense @ 2023-10-23 21:00:06

This is quite an impressive tech feat! Although I have one question in regards in the mutliplayer mode. How would I be able to access the Sonic 2 levels of mutliplayer? I'm only able to see the Sonic 3's competiton mode.

Neto @ 2023-10-24 06:35:09

The multiplayer is in an experimental state. You can try it by holding B when selecting any level in level select menu. Note that the sprites are not optimized to double interlaced yet (The updates will be released after SHC ends).

PsychoSk8r @ 2023-10-24 11:07:59

I remember when this romhack was a humble repair of Sonic 2 beta, making playable the extra levels. It has come a long way over the years! All games in 1 Rom as a continuous flow. Something my younger self only dreamed of!

Kronos @ 2023-10-26 19:20:48

The transition scenes from one zone to another add extra charm and make the entire game mechanics more fluid with the latest Sega releases (Sonic 3 & Knucles). The originality of the new boss in the desert zone is super interesting.

The technical advances this game makes with each passing year are surprising. When looking at the first versions, it seems unreal that twenty years ago we would have had the right to choose some possibilities of how to play.


Neto @ 2023-10-27 03:52:32


Gufighter @ 2023-10-26 20:55:50

Great job! well-crafted act transitions, new boss, game getting better and better.

Is there any option to remove the 3 rings in the death egg? It ended up being too easy

Neto @ 2023-10-27 03:58:06

Thanks and currently is not possible to remove rings from Death Egg.

arturfreddy @ 2023-10-27 06:32:03

Parabéns Neto, gostei muito dos avanços!

Neto @ 2023-10-27 06:49:27


Kronos @ 2023-10-28 14:31:46

I tested the multiplayer mode. Even though it is in an experimental state, it will be a great milestone to be able to play in a competition with any zone.

darkgrey @ 2023-11-05 11:40:34

Well , you did it ! Keep up the good work . I hope that you will add zones of 8-bit Sonic .

KirbySegaSonic2020 @ 2023-11-09 16:05:08

Great work, Neto & Team! But there's one little thing: You guys should add more level and zone transitions to the Sonic 2 portion of the game, because it creates inconsistencies in between all of the levels of the Hack ROM.

KirbySegaSonic off!

FancyDoggy @ 2023-11-13 08:32:10

Character limit exceeded, sorry, here's a link to it though:

Last modified by FancyDoggy @ 2023-11-13 08:33:17

Sonicvnfan @ 2023-11-20 23:40:50

this hack is very cool i like it & i use a android emulator thật never crash .

SSSonic @ 2023-12-25 02:40:29

Nice one neto but i want you to do the listings please.

1. Tails sprites should be Plush Arif Tails

2.Knuckles should have super sprites from Custom super Knuckles Sprites

3.Sonic's Super and hyper sprites should be complete

4.Tails should be able to go hyper when collecting all super emeralds

5.All these things required should be for the SHC2024 Release

Best of luck neto :)

SierraStarKitty @ 2024-02-02 20:34:28

Hi Neto. I really like this hack you made. i want to try to make a hack my self but not sure how and thought maybe you could help me in learning

Cool_kid @ 2024-02-29 15:51:34

You can play this game using retro arch GX the only glitches ive ran into so far is the camera being a little jank and when the invinciblty music stops during the score tally it goes back to the level music and not the level clear music Also are you planning to add sonic cd or would It be to hard/impossiable to add?

Last modified by Cool_kid @ 2024-03-02 11:21:31