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Sonic the Hedgehog 3 & Knuckles cover art

InstallReimplementation

Sonic the Hedgehog 3 & Knuckles

Sega Technical Institute · 1994 · Genesis

Get it on GitHubHow to play

Doesn't play in a browser tab yet: it plays on your own device. Opens github.com in a new tab. Follow it to see on your home page when it comes out, or plays here.

On your device

Install

A build to download from the project and run on your device.

  • sonic3air

    By Eukaryot662 stars on its repository

    Releases

    Reimplementation

    Latest release v26.08.15.0-test, Aug 15, 2026 (a pre-release)Code last updated Oct 18, 2026License: GPL-3.0

    How to play
    1. Download a build from the project's release page: its files say which systems they run on.
    2. The project's page says what it needs from your own copy of Sonic the Hedgehog 3 & Knuckles, if anything.
    3. Launch it.

  • Sonic3AndKnucklesRecomp

    By mstan18 stars on its repository

    Releases

    RecompilationWindows

    Latest release v0.5.3, Oct 18, 2026Code last updated Oct 20, 2026

    How to play
    1. Download the build for your system (Windows) from the project's release page.
    2. The project's page says what it needs from your own copy of Sonic the Hedgehog 3 & Knuckles, if anything.
    3. Launch it.

From SubmitGame's list, read Oct 21, 2026, with releases, stars and licenses as each project's repository gives them. The steps are the same for every project of a kind: its own page has the details.

Under the hood: every project behind it, its license and code, how they connect, and who made them.

News

All news
  1. Release · Oct 18, 2026Sonic3AndKnucklesRecomp v0.5.3, and 9 more since May 31, 2026
  2. Pre-release · Aug 15, 2026sonic3air v26.08.15.0-test, and 9 more since Dec 5, 2024

About

Sonic the Hedgehog 3 & Knuckles (or simply Sonic 3 & Knuckles or Sonic 3 Complete Edition) is a platform video game which is the result of locking-on Sonic & Knuckles with Sonic the Hedgehog 3 using the former catridge's unique "lock-on" technology. It is essentially a large combined game of its two lock-on components and contains all Zones from the said games and also contains special features unique to this game. This would have been the original Sonic the Hedgehog 3 the developers intended but time constraints by Sega resulted in the game being split into two.

Description from IGDB.

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