Sonic CD++
Sonic CD++ is a hack for the Sega CD.
About this hack
Sonic CD++ is a hack for the Sega CD. In short, it changes the music or sound, improves the controls and reworks the graphics. The full list of changes, the credits and the instructions are on the creators' page.
Playing it
The patch is applied to your own copy of Sonic CD++, following the creators' instructions. The game itself is not included and is never linked here.