I'll just comment to say that given the bad reputation the Sega CD has, it is good to see so many games that are being debated for a Top 20. So the system has a lot more "good" games than people like to admit. Obviously, we aren't having trouble thinking of 20-25, or even 30+ "good" Sega CD games. Funny how a few a**holes (not on this site) like to practice revisionist history and say that the Sega CD was a "failure."
It doesn't belong in the Top 20 but the Sega CD does a great version of FIFA International Soccer which I've never heard any praise or reviews for online. Too bad, since it is an excellent title.