What are your Favorite "old-school" games?
 

Mine are:

Street Fighter
Batman Returns
Pac-Man
TMNT Turtles in Time
Original Metroid
Spider-Man/Venom: Separation Anxiety

Alls I can think of so far.

NES:

Metroid, Zelda, Super Mario, Final Fantasy and Ninja Gaiden

Master System:

Zillion and Shinobi

SNES:

Super Metroid, Final Fantasy 3/6, Turtles in Time, Castlevania 4, SF 2-Super SF2

Genesis:

Valis 1, SD, and 3, Shining Force 1, Shinobi 3, Shadow Dancer and Beyond Oasis

TG16/Duo

Valis 1-4, Rondo of Blood, Cosmic Fantasy

bubble bobble
pac man
dizzy the adventurer
ducktales
tmnt 1 2 3 and 4
mega man x
joe and mac
dk
ken griffey jr major league baseball

SNES:
Super Mario World
Yoshi's Island
DKC series
Zelda III
FF6
Terranigma
Lufia II

Gameboy:
Super Mario Land 2 and 3
Zelda IV
TMNT 2
Tetris

hmm...a lot aren't that oldschool but

puyo puyo
bubble bobble
tmnt iv
final fight 1-3
earthbound
ogre battle
super mario 3, world
king of fighters
street fighter 1, 2
most any megaman, kirby, bomberman

In no particular order, and listing only pre-PSX games (mid-1995 and earlier):

Arcade
Bubble Bobble
Donkey Kong
Mr. Do!
Mappy
Street Fighter II series
Mortal Kombat 1, II, and 3
Puzzle Bobble/Bust-A-Move 1 and 2
Puyo Puyo 1 and 2
The Punisher
Final Fight

Genesis
Ristar
Sonic 1, 2, 3, and Knuckles
Streets of Rage 2 and 3
Soldiers of Fortune/Chaos Engine
Mean Bean Machine/Puyo Puyo
Blades of Vengeance
Eternal Champions

32X
Tempo
Chaotix

SNES
Super Mario World and All-Stars
Tetris Attack
Tetris & Dr. Mario

NES
Super Mario Bros. 1 and 3

TG-16
Parasol Stars

I don't know or care how 'old-school' these games would be, but Sunset Riders, Gunforce 2 and Sexy Parodius are some of my favorite arcade titles.

NES
Castlevania I and II
Shadowgate
Solomon's Key
Pin-Bot
Zelda 2
Jackal
Rolling Thunder
Stealth ATF

Genesis
Captain America and the Avengers
Eternal Champions
Dinosaurs for Hire
Rocket Knight Adventures
Castlevania: Bloodlines
Maximum Carnage
Dune II: The Battle for Arrakis
Splatterhouse 3
Shadowrun

Ninja Gaiden 1 & 2
Wizards and Warriors 2
Zelda 1 & 2
Double Dragon 2 (NES version)
Double Dragon (Arcade version, NES version is crap)
Castlevania 2
Kirby's Adventure
Super Mario Bros 3
MegaMan 2 & 3
Metroid
Final Fantasy
Maximum Carnage (SNES version)
Super Nova
Final Fantasy 3(6)
Rockman and Forte (SNES version)
Legend of Zelda: Link to the Past
MegaMan X3
Rockman World IV (GB)

Ah I could go on for a lot longer lol

Some of my favorites would be: TMNT, Super Mario Brothers 3, Yoshi's Island, Pac-Man, Super Mario World, Dr. Mario, Kirby's Adventure, Rainbow Islands, Bubble Bobble, Tetris

How could I ever put my favorites into a particular order? I love them all so much:

NES & GAMEBOY:
The Legend of Zelda I & II
Super Mario Bros. 3
TMNT - The Arcade Game
TMNT- Fall of the Foot Clan

SNES:
TMNT IV - Turtles in Time
Mario Kart

GENESIS:
Sonic The Hedgehog I & II
Maximum Carnage
Toxic Crusaders
Toejam & Earl (I don't care what anyone says, YO!)

PC:
Doom
Wolfenstein (I feel so old, I thought there was no way games would ever get better than these)

Is N64 old school yet? Either way, I'm going to throw WWF No Mercy out there.

Also:

WWF Superstars for the arcade
X-Men arcade
Ninja Turtles arcade
Mortal Kombat
Mega Mans 2 and 3

Game Boy:
TMNT: Fall of the Foot Clan
Star Wars
The Legend of Zelda: Link's Awakening


Genesis:
TMNT: The Hyperstone Heist
Haunting: Starring Polterguy
James Pond 3
NHL '94
B.O.B.
Mortal Kombat
General Chaos
Blades of Vengeance

If Dreamcast counts as old school, I'll throw Crazy Taxi out there.

Define old school. Before which year?

Because my two top favorites- Final Fantasy 6 and Zelda II The Adventure of Link are both very old. I was in the 6th grade during Zelda II and in the 9th or 10th grade during FF6. But I did not play FF6 till I was in my 20s.

The oldest game I can think of is RocketKnight Adventures, for the Genesis. And there used to be this old PC game called Jill Of The Jungle. I'd play that for hours. It was Shareware LOL.

I like TONS of old school stuff. I'd probably be here all day if I tried to think of every single one. :D

I don't know if the PS1 is considered old school but I absolutely love
Bust-A-Move 98!

SNES
Yoshi's Tetris, or is it Tetris Attacks? (I Can't Remember)
F-Zero

Atari 2600
Keystone Capers
Plaque Attack

Commodore Vic 20
PAC Bomber (That one ran off the cassette add-on!)
Omega Race