There's a list of MegaCD titles on wikipedia, if that helps your cause.
Just don't play it again when you find out. It'll be shit.
( Ttssattsr, Thu 9 Jul 2009, 2:58, archived)

The racing game was for the MegaCD.
The plaform game was just for the Mega Drive.
( JessAction Give me all your expensive brandy and hubcaps., Thu 9 Jul 2009, 3:08, archived)