@krytern said in CHD games not working for Sega CD.:
Looks like it is a problem with the CHD file.
sounds like you may not have converted it properly.
I downloaded Sonic CD to test ...
Firstly, you need to use CDmage (V1.02.1) to convert the 35 *.bin file tracks of Sonic CD into a single *.bin before you can use CHDMAN
after that you will have just 2 files ..
Sonic CD (USA).cue
Sonic CD (USA).bin --------- which is 587,601KB in size
after running CHDMAN
Sonic CD (USA).chd --------- 329,386KB
which is approx 12MB larger than your 317MB file
Tested it with my setup, and it works fine