Mine would have to be Sonic 3 and Knuckles, with Sonic Adventure 1 coming in a close second. The only reason that Sonic 3 and Knuckles is better than Sonic Adventure was because of the Big part of the game. I hate that big purple cat.

Streets of Rage 3 is my favorite SEGA game. It has the best gameplay in the series, and it offers a lot to those who play it. The game has 4 different endings, the biggest roster of enemies in the series, fast-paced gameplay, good mechanics, unlockable characters, great level design, and the option of picking between two final stages. I also play this game the most out of every game I play.

My favorite Sega game would have to be The House of the Dead 2 or Sonic Adventure, I played them both a lot when I was an kid.

You know, I might try playing Altered Beast, it seems to be so popular.

GenesisJunkie : You're welcome

Super Monkey Ball 2, mainly for the multiplayer. Monkey Flight was awesome.

My favorite SEGA games would be the Sonic the Hedgehog family of games, but my favorite StH games of all time would be the 1st StH game for the SEGA GENESIS, SONIC ADVENTURE for SEGA Dreamcast, SONIC & SEGA ALL-STARS RACING, SONIC CD for the SEGA CD, SONIC THE FIGHTERS, & SONIC & ALL-STARS RACING TRANSFORMED.

My favorite non-Sonic SEGA games would be:

CRAZY TAXI (the 1st)
AFTER BURNER series
Virtua Fighter series
Virtua Racing 
SEGA RALLY series
Virtua Tennis
FIGHTING VIPERS
Super Monaco GP
GOLDEN AXE
COMIX ZONE
& FULL AUTO 2: BATTLELINES.

For me, my favourite Sega games will always be the Sonic franchise, I thought he was always cool, I even enjoy his modern games a lot of people seem to hate such as sonic and the black night, or sonic unleashed.. However, I do like the Jet Set Radio Series. When I first found out about it, I thought the game looked really fun and fresh. I love the cel-shaded style, the hip-hop sound track, and the crazy characters. I really think Sega should reboot Jet Set Radio, with new characters, new music, and make the game feel fresh and new again.

I love so I and saga all stars racing. I enjoy racing games, and it was basically a spin off of Mario kart that I enjoyed.
I also really loved crazy taxi, like video game dunkey.

From Sega, I would probably pick games like Super Monkey Ball, Sonic the Hedgehog 2, Kid Chameleon, and even A Toy Story. Those games are quite amazing. But if I had to pick all of them, I would pick...Greendog, the Beached Surfer Dude! The game is so out of whack, it's addicting.

The original 3 sonic games. To be honest, they were the only Sega games I played.

PixelBrick :

Favorite SEGA game?

I'd have to say a toss between Super Monkey Ball and Altered Beast.

My favorite sega game would have to be sonic adventure 2 battle , I remember getting this when I turned 12 and I've been crazy about it ever since. Still trying to feed and take of my cute chaos and my second favorite would have to be Sonic Adventure.

Obviously Sonic would be my favorite with Sonic 3 and Knuckles being my number 1 Sega game of all time with that being said other than sonic my other Favorite Sega games would be Streets of Rage 2, comix zone (although this game is hard), and Revenge of Shinobi 

For Sega?
ummmmmmmm...

"Earthworm Jim".





Good Luck To All.
Peace.

My fave SEGA game is Mean Bean Machine!(AKA Puyo Puyo)
I love the BGM in it and for a puzzle game, Its Addicting, And definitely worth a lot of replay value!

My favorite SEGA game would probably be Sonic. In fact I think I'm not even played other SEGA games.

Although I didn't play that many Sega games, I always played the Sonic series because they're so fun to play.

Well, set aside the Sonic games... I have few 

 
~Vectorman~

You play as a rouge-bot (pun intended) in the future that tries to save the world from a tyrant leader. This was a hard game for me, but I found it quite enjoyable, I likes how it was an adventure and shooter game, it was overall a good game with involving levels and a interesting backstory.
 

~Super Monkey Ball 2~

A game where you're a monkey in a ball, and you had to tilt the course to get the monkey into the goal, surprisingly better than it sounds!

Set aside the *coughcough* monkey chant thing after each world in story mode *coughcough* I really liked the game, it wasn't a hardcore game, but was fun to play when nothing else was available, I remember being especially good at monkey target and racing, though I could never clear advanced mode without using a continue...
 
So many memories of that game in my childhood....  
 
 
~SEGA and all stars Racing transformed~ 
 
A fun arcade style racing game with boosts and drifting, to be expected from sega since they made "drift" and similar arcade racing games. 
 
What can I say, it's a racing game with some cool courses from SEGA's past, planes and boats, and even wreck it wralph.
 
 
~Ristar~
 
 A game where you play as a black ball with stretchy arms and a over-sized star mask on his face.  
 
This was kinda a weird game, but I liked it all the same, though I did find it kind of difficult getting use to the stretchy arms to get around and to attack.


Actually, I think that's all the SEGA related games outside Sonic I've played and actually liked...
 

Well look who just double posted.