Your fav Genesis game?

What's your favorite game for the Genesis? As most know the Sega Genesis was a earth shattering console. Maybe not up their with SNES in games but great in graphics. I for one loved almost every Genesis game. I converted to N64 which was a big mistake. Anyway tell me. Mine is....? Geez hard to decide. I'll say MK Trillogy. I loved the way they combined the characters from the other ones. My second is Sonic 2 or 3.