Turned out a lot less, but I finally found them all regardless. And there's one more that isn't listed here at Gamespot (probably because it isn't a game).

Sega of America Presents : Rock Paintings

The only reason I'm saying something about it is because it's a CD+G. I haven't tried it yet, but it has track listings like a music CD.

Maybe I'll fire it up in the good ol' emulator one of these days.

And yes, I'm being fair about everything I list, I do legitimately own all of these games. No downloads here. I don't list anything that's been downloaded (except for freebie games like Pirates of the Caribbean Online or Anarchy Online). Seeing as how I don't own a Sega CD, I've gotta play them somehow.And I don't wanna hear any of that crap about the BIOS for a long dead system.