What's your favorite Sega game from the different systems over the years?

[celerystalker]

Master System: R-Type. Still amazed at what a good port it is.
Genesis: Castlevania Bloodlines. Can never get enough classic Castlevania.
Saturn: Galactic Attack. I really enjoy this one, but admittedly haven't played a ton of Saturn games.
Dreamcast: Shenmue. One of my all-time faves.
GameGear: Streets of Rage 2. Fun little beat-em-up, which I have a big soft spot for. Like the Saturn, I haven't exactly played lots of GG games.

I think that even if you had played a ton of Saturn games, Galactic Attack would still be an outstanding choice. I think it's still my favorite shooter for the system, even after playing the Radiant Silverguns and Battle Gareggas out there... awesome game!