I'll save the day:
SEGA PC RELOADED
Sonic CD, Sonic & Knuckles Collection, and Sonic 3D Blast, all optimized to run on modern computers!
Link:
https://drive.google.com/file/d/1KPO...ew?usp=sharing
INSTRUCTIONS:
1. Extract the archive wherever you want.
2. Run SEGAPCReloaded.exe in the folder's root directory.
3. On the upper left of the launcher window, select Install Game, and select "Sonic CD", "Sonic 3D Blast", or "Sonic & Knuckles Collection".
4. A window will pop up asking if you wanna install from the original discs, or select a folder where it's already installed. Select "Already Installed", and select the corresponding game folder in the root directory.
5. Repeat Steps 3 and 4 for the other two games.
6. Go back to the game selection portion of the launcher, select "Launch Game", then select one of the three games. Enjoy!
NOTES:
-You should not have to configure anything (except maybe the controls). I took care of all that. The CD Audio for Sonic CD and Sonic 3D Blast is also fully intact.
-There's two game folders for Sonic CD, one labeled JP and one labeled US. The JP folder uses the original Japanese soundtrack and FMVs, while the US folder uses the North American soundtrack and FMVs. You can switch between the two by selecting Install Game from the launcher and reinstalling Sonic CD.
-The graphics will appear distorted unless you run the games at a resolution that's a multiple of 320x240, such as 640x480 and 1280x960. 1280x1024 looks OK as well.