Someone recently asked me what my favourite games from older (not current gen platforms) were that I considered 'classic'. Here they are, probably with some glaring oversights, chronologically inaccurate and in all likelihood giving away how old I am....

Star Wars (Arcade)
Afterburner (Arcade)
Marble Madness (Arcade)
Karate Champ (Arcade)
Yee-Ar Kung Fu (Arcade)
Asteroids (Atari 2600)
Space Invaders (Atari 2600)
Mazogs (ZX81)
3D Monster Maze (ZX81)
Manic Miner (ZX Spectrum)
Jet Pac (ZX Spectrum)
Freefall (BBC Micro)
Twin Kingdom Valley (BBC Micro)
Starship Command (BBC Micro)
Elite (BBC Micro)
Tetris (GameBoy)
Zelda, Link to the Past (GameBoy)
Flashback (SNES)
Super Mariokart (SNES, GameBoy Advance)
Doom, Doom 2 (PC)
Quake 2 (PC)
Half Life (PC)
Age Of Empires (PC)
Resident Evil 1, 2, Nemesis, Zero (PS1)
Super Mario 64 (N64)
Zelda, Ocarina of Time (N64)
Shadow of The Colossus (PS2)