Your Favourite Old Video Games That You Still Play

How old?

Any arcade shmup circa early 2000s

Front Mission 3 on PS1, but downloaded a copy of it to PSP to play again

Seven Kingdoms
Shadow Company
The Neverhood
A bit younger - Max Payne 1

Stronghold (DOS)

giana sisters & creatures - c-64,catlevania gb,tekken 3 - ps1,grandia 2-dc,def jam new york-ps2

starcraft

The legend of Zelda, Ocarina of Time. I beat it like once a year.

rocks. we used to throw it!

Nes - Super Mario Bros, Contra, Hudson's Adventure Island 1 and 3, Teenage Mutant Ninnja Turtles 2
/ PS1 - Syphon Filter, Crash Bandicoot

Mario Kart 64 is still my favorite game of all time, with Diablo 2 not far away. None of them are incredibly old, but they're quite old and from my youth.

jagged alliance 2

Counter Strike 1.6. Still rocking that bad boy.

I want to play the first Harry Potter game...

I've played Swat 4, Metroid Fusion, Pokemon Ruby, Star Wars Battlefront 2 and Half life series (and mods) a lot.
Edit: and WarcraftIII

Super Mario 64 with an emulator

Spyro 2: Ripto's Rage and Harry Potter and the Sorcerer's Stone for the PS1. Some of my first video games and still my favorites.

Super Mario World on the SNES, but i replay a lot of old games on a yearly basis.
Golden Sun, A few Zelda titles(Oracles of Ages/Seasons just recently). Super Smash Brothers every once in a while, Monkey Island...
I actually play more old games than new ones, it's hard to remember them all at once.

Donkey Kong Country, Super Mario World, Unreal Tournament, Doom.

Mad TV

PC: Doom, Gothic 1&2, Duke Nukem 3D, Death Rally (original), Carmageddon 1&2.
PS1: Crash Bandicoot 1&2&3, Spyro 1&2&3
Sega: Sonic
C64: Henrys house, Boulder Dash

There is some of them which I play.

Contra
Tetris
Unreal Tournament '99
Skies of Arcadia

There are also a few older PC games I've been meaning to either revisit or play for the first time but haven't actually gotten around to yet: Tie Fighter/XvT/XWA, Daggerfall, Eric the Unready, and probably a couple others I'm forgetting.

C64 - Wizard of Wor.
Still playing on emulator + on real machine. :)

PC - Too much to list...
Tyrian2000, Oddworld: Abe's Exoddus, Abuse, Re-Volt (even on MP), Old Need for Speed series etc.