Project Information

A new demo of the ROM hack that no-one has been asking for is finally here! Sonic the Hackable features new stage layouts, new gimmicks and new moves, including the speed-breaking air dash. Those who dare to revisit South Island will find a new and challenging experience.

This hack is currently still in development. Be in the lookout for new updates in the future.

Crush Dr. Eggman!

After Dr. Eggman's defeat in Sonic the Hedgehog 4: Episode II, the Death Egg MK II has crashed into the ocean next to South Island. The giant wave created by the Death Egg MK II's collision with the ocean surface has even caused parts of the island to go underwater!

Not long after Dr. Eggman managed to escape to land, he became enraged upon seeing where he was. South Island was the place where his first defeat by the hands of Sonic the Hedgehog had happened, so this island held a particularly bad memory for him. Filled with rage, Dr. Eggman swore that this is the island where he will end Sonic once and for all. Now, by using his past knowledge of the Island and by renovating his old base, Dr, Eggman built his new fortress on South Island.

Dr. Eggman has also planned to use the six chaos emeralds (which Sonic apparently lost, again) as a power source to relaunch the Death Egg MK II. It's once again up to Sonic to stop him!


Project Leader: CHRdutch

Tools used

Original Game: Sonic Team

Sonic 1 GitHub disassembly: Hivebrain, Stealth, drx & Esreal

SonLVL: MainMemory

S1SSEdit: MainMemory

SonED2: Stealth

Tilemolester: SnowBro

Sonic One Music Editor: fuzzbuzz

Sonic 2 GitHub disassembly: Nemesis, Aurochs & Xenowhir

lNewNeko Palette Editor: Nineko

Music Pointer Fixer: Erik JS

SMPSConv: ValleyBell

SMPS research pack: ValleyBell

mid2smps: ValleyBell

Nineko Midi Event Editor: Nineko

The Sega Data Compressor: Magus

SonMapEd: Xenowhirl

Sonic 4 Episode I midi's rip: evilhamwizard

SMPS2ASM: flamewing

Ultimate Sega Hideki sample pack 3.1

gmv2bin: Mercury

Flex 2: snkenjoi





Guides used

Spindash Guide Part 1: Lightning & kram1024

Spindash Guide Part 2: Puto

Spindash Guide Part 3: shobiz

Spindash Guide Part 4: Mercury

Different songs per Act: nineko

Dynamic Palettes: PsychoSk8r

PAL Music Tempo Guide: Crash

Walk Jump Bug fix: Cinossu & Mercury

Spike Bug fix: FraGag

Fix the SEGA sound: Puto

Display Press Start Button Text: Quickman & Egor305

Water Guide: Tornado

How to make a good custom palette: Mr. Cat

SMPS Guide: Markeyjester

Use Dynamic Tilesets in Sonic 1: HPZMan (Only Dynamic Pattern Load Cues were used)

How to make a good sounding mid2smps conversion: A-S-H

Remove the speed cap: Tweaker & Puto

Fix Song Restoration Bugs in Sonic 1's Sound Driver: Markeyjester & Clownacy

Fix demo playback: FraGag

Fix the camera follow bug: MarkeyJester

Fix the HUD blinking: Quickman

Optimize ring scattering: SpirituInsanum

How to implement "Dimps ring physics" in Sonic 1: Shockwave

Fixing the top-right corner reloading glitch in S1: SpirituInsanum

How to record a demo: Mercury

Extend ROM Chunks to $FF in Sonic 1: GenesisDoes

How To: Reversing the Timer in Sonic 2 (ASM): DLloyd

How to optimize Shield Art loading in Sonic 1: SuperEgg




Level Design


SMPS Remixes

GHZ2 - Sylvania Castle Act 2: LackofTrack

GHZ3 - Splash Hill Zone Act 3: LackofTrack

MZ2 - Lost Labyrinth Act 2: Spanner

MZ3 - Sylvania Castle Act 3: Spanner

SYZ2 - Night Carnival Zone: CHRdutch

Boss Pinch - Sonic 4 Boss Pinch: LackofTrack

Invincibilty - Sonic 4 Invincibilty: LackofTrack

Title Screen - Sonic 4 theme: LackofTrack

LZ1 - Lost Labyrinth Act 1: LackofTrack

LZ2 - Lost Labyrinth Act 2: LackofTrack

SBZ1 - Mad Gear Act 1: LackofTrack

SBZ2 - Mad Gear Act 3: LackofTrack

FZ - Sonic 4 Final Boss: LackofTrack

Sound Test $9C - Sonic 4 Cutscene: LackofTrack

DualPCM sounddriver by MarkeyJester




Bug fixing help










Sonic Title Font: SEGA Enterprises

AKnotholeResident Sonic 4 rant (SEGA sound)



If you wish to contact me, simply sent me a PM on either this forum, SSRG, Sonic Retro or my Twitter.

The download is temporarily not available
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Latest reviews

It's fantastic. I really like the use of Sonic 4 themes in it. The game delivers exactly on what it wanted to, and that is level design. Even Stealth had some issues with the spike timing in Marble Zone Act 3, and I did as well but not so badly, I think it's a bit unfair and it might be easier to some players to replicate and that's why it was overlooked, but the fact that the game gets harder or explores a way to create harder level design over the original STH is not bad.


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