A fan-made widescreen remaster of Sonic 3 & Knuckles.
Before downloading, please note that you need a compatible Sonic 3 & Knuckles ROM, like the one from
S3&K on Steam 
.
Early 2024 Update - v24.02.02.1
Recommended download.
Includes the actual game, as well as the open source game scripts.
Please note: The remastered soundtrack is not included any more and needs to be downloaded from within the game's Options menu.
Download ZIP via Github
View Changelog
Current Preview Version - v23.11.18.0
Slightly more experimental.
Note that the preview version is just an intermediate build or a candidate for a proper update.
It is not well tested yet and possibly contains new bugs.
Before downloading, please note that you need a compatible Sonic 3 & Knuckles ROM, like the one from
S3&K on Steam
.
Early 2024 Update - v24.02.02.1
Recommended download.
Includes the actual game, as well as the open source game scripts.
Please note: The remastered soundtrack is not included any more and needs to be downloaded from within the game's Options menu.
Download TAR.GZ via Github
View Changelog
Current Preview Version - v23.11.18.0
Slightly more experimental.
Note that the preview version is just an intermediate build or a candidate for a proper update.
It is not well tested yet and possibly contains new bugs.
The macOS port by Sappharad.
Before downloading, please note that you need a compatible Sonic 3 & Knuckles ROM, like the one from
S3&K on Steam
.
.
The mobile port for Android.
Before downloading, please note that you need a compatible Sonic 3 & Knuckles ROM, like the one from
S3&K on Steam
.
You will need to transfer the ROM file to your Android device.
.
The Beta version for iOS and Web by Sappharad.
Before downloading, please note that you need a compatible Sonic 3 & Knuckles ROM, like the one from
S3&K on Steam
.
You will need to transfer the ROM file to your iOS device.
.
Join the official Sonic 3 A.I.R. Community Discord Server !
For news on the project, follow me @eukaryot.bsky.social on Bluesky .
I'm also still on the platform formerly known as Twitter (@Eukaryot3K) .
Sonic 3 A.I.R. is Open Source! Check out the whole project on Github .
There's a Manual PDF to check out!
You can find useful information on various topics in there, including troubleshooting problems as well as explanations for the in-game options.
(Yes, this is the same as the one included in all game installations.)
There's some questions I get asked practically every single day. So here's some answers.
How do I install Sonic 3 A.I.R.? (Windows)
Just download one of the ZIP files for either the stable or preview versions, and extract it to some location on your hard drive (e.g. on your desktop, or your documents folder, etc.). Now you can start the Sonic3AIR.exe there. That's all.
How do I update to a new version of Sonic 3 A.I.R.? (Windows)
It's as easy as installing the new version, preferrably to a different location than the old installation. Your existing save game data will be used by the new version as well, as it's stored outside of the actual game installation (see the game's Manual PDF for details).
After a quick check if the new version is working, you can safely delete the old game installation.
How do I install / update Sonic 3 A.I.R.? (Other platforms)
Have a look at the Manual PDF , you can find all information there.
What to do when there's graphics issues with Sonic 3 A.I.R.?
Changing the renderer to OpenGL Software could help. If not, try switching to fail-safe mode. For instructions on that, have a look at the Manual PDF linked above.
What to do when the game just crashes on startup?
A common problem is graphics driver issues. You should definitely make sure your graphics drivers are up-to-date. If you're at the latest drivers already, you can still switch the game to fail-safe mode, as described in the Manual PDF linked above.
The Sonic 3 & Knuckles Steam ROM is not available for purchase any more, what now?
Unfortunately, there's no easy answer to that. You might be lucky and already have Sonic 3 & Knuckles in the SEGA Mega Drive & Genesis Classics on Steam. If not, check out these legal alternatives .