Here's one that I doubt anyone has mentioned: Scooby-Doo Mysteries
No, I am NOT trolling. It sounds like it would be just another licensed platformer, and as far as I know, the SNES version is just that, but the Genesis version does something so unique for the platform and does it so well, that it deserves more exposure. It's actually a LucasArts-style point-and-click adventure game, and a fairly good one at that! It's not easy or dumbed down, either. Some of the puzzles are deviously challenging , but quite clever. If you're into this style of game, you NEED to check this out, Scooby-Doo fan or not.