A new fan-made Sonic 3 modification is giving Sega's 16-bit original a surprisingly modern second life. Developer Liliam released a playable Sonic 3 Unlocked demo for Sonic Hacking Contest 2026 on 23 October, introducing additional characters, new movement options and an Encore-style mode to the Mega Drive / Genesis game.
Six characters, different ways through Angel Island
Alongside Sonic, Tails and Knuckles, the demo adds Amy Rose, Mighty the Armadillo and Ray the Flying Squirrel. Their inclusion goes beyond swapping sprites: Amy's hammer-based movement, Mighty's defensive rolling and Ray's gliding offer different approaches to the familiar stages. Sonic also gains a Drop Dash inspired by later entries.
Bringing those ideas back to a 1994 Mega Drive title involves working within the console's limited colour palette and animation resources. Liliam has adapted graphics from later Sonic releases and created additional artwork to make the new moves work in the older game engine.
Encore Mode changes how a run works
The other headline addition is an Encore Mode inspired by Sonic Mania Plus. Rather than committing to one character for an entire stage, players can switch between team members using the A button. Different abilities can open up fresh routes through areas that longtime fans already know by heart.
The hack also addresses smaller frustrations. Cutscenes and score tallies can be skipped, Tails' assistance is easier to control, and Super transformations now have a dedicated input to reduce accidental activation. Some objects and scripted moments have been sped up.
It's a demo, not a finished definitive edition
The developer is clear that work remains. Encore's alternative stage palettes and new Special Stage layouts are not yet included, while collision quirks affecting some characters are still being addressed. There is no confirmed release date for a final build.
This is an unofficial fan ROM hack, not a Sega-endorsed release. It uses and adapts elements from existing Sonic games; players should check the developer's instructions and the rights and compatibility implications before trying it on their own hardware or flash cartridge.
Console Revive take
For Mega Drive fans, the best homebrew and ROM-hacking projects do more than add novelty: they give you a reason to return to an original console and rediscover how its games were built. Sonic 3 Unlocked is especially interesting because its new character abilities can change how you navigate the same classic levels. We're keen to see how the completed version performs on real hardware.