Old games(Made before 2012) that you still play to this day

Nice Thread. For me its a lot, so I'll list the oldest ones:

DemonStar
Wolfenstein 3D (on NewWolf)
Ultimate Doom, Doom 2, Heretic and Hexen (On Doomsday)
Duke Nukem 3D (on eDuke)
Quake 1, 2, Arena and 4
Need for Speed 2 SE, 3 (Hot Pursuit), 5 (Porsche Unleashed), 9 (Most Wanted) and 10 (Carbon)
Oni
Midtown Madness and Monster Truck Madness 2
Street Fighter 95 (Zero)
Virtua Cop 2 and Virtua Fighter 2
Fifa 2001
Dave Mirra Freestyle BMX
Also my entire Dos Game collection on D-Fend Reloaded

I still regularly play Civilization II (with these fixes)

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Yesterday I played Heroes of Might and Magic III, a classic turnbased strategy game first released in 1999. And also yesterday I played a quick match of Age of Empires II, another game from 1999 (that was a good year for games!).

Considering starting the Krynn series from the Gold box range. Recently downloaded that one from GOG, first one in that one is from 1990.

Quake from time to time, and (not Steam) Links 2003, still the best (for me) golf sim ever, with dozens of real official courses, and hundreds of fan-made real and fantasy courses. A shame M$ bought Access to make one good version, a decent following, and then port it to XBox to let it die.

diablo II
imperialism
master of orion II
to name only a few I played most recently :)

Well I just 100%ed WItcher 2 on GoG yesterday after playing it for a full week.
As for "from time to time" for me it's Splinter Cell Conviction

The oldest game that I play is the arcade game Red Baron, from 1980.

Between 1981 and 2011 there are far too many to list.

Warband, and even occasionally the original Mount & Blade (which, apparently, I have 260ish hours in on Steam, definitely some more on Epic too).
Others that I dip back into are OG Doom, Quake, the Broken Sword series (and various other point and clickers).
Oh god, Half Life.
I could keep going but I'm getting slightly depressed at the eternal steps of time.

Playstation 1, 2 & 3 games, Vampire Bloodlines, HoMM 3 & 5, Dungeon Siege 2, Overlord 1 & 2, Danganronpa, Kingdom Rush... the list goes on. Constantly (re)playing "old" games.

I love(d) Tyrian2000. Still play it from time to time thanks to GOG.

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Currently playing Deus Ex GOTY for the first time and I am amazed they made a game that much ahead of its time. If it came out right now with no changes and just with current graphics quality it would still have gotten so many positive reactions.

Other than this, the oldest games I still play from time to time are Super Mario Bros 3 (SNES version), some 90s LucasArts gems like Monkey Island 1-3 and Day of the Tentacle and as obvious from my username, Grim Fandango

I played through Super Mario Bros the other day, and do so every few months, so yeah...

It holds a lot of nostalgia for me, being my mother's favorite game, and being part of one of the oldest memories I have from when I was a very small child, so I boot up an emulator every so often to play through it for nostalgia's sake. Love it every time.

one that most comes to mind is Legend of Zelda: Ocarina of Time.
Randomizers of course, vanilla would be boring... and cutscenes.

Terraria and Minecraft although not so much minecraft anymore

Last year I was playing through a lot of games that would qualify (Sonic Adventure 1, Kirby 64, Duke Nukem Manhattan Project, REZ, etc) but I think everything that I played so far this year came out after 2012.

Edit: I checked and Bejeweled 3 is from 2010, so I guess that one counts.

Replaying RDR1 now that it runs at 60 FPS with an XBOX emulator, it feels great. Probably my favorite game of all time

RE 4 from 2005
I love it...
Also been playing the original Diablo from 1997
my guilty pleasure.

I try to not because of backlog, but sometimes I just have to play some of mine all time favorites:
postal 2
stronghold crusader
serious sam
fallout 1 or 2 or tactics

Fun fact - I couldn't finish FT on my last attempt (about year ago) because I abused random encounters xD I tried to find them all - and inndeed I found them all... So when I was travelling to last base - and there was forced random encounter on the way... Game crashed , because there was no random encounters left xD

Most of the games I play are made before 2012. I didn't play many games when I was a teenager so I'm trying to catch up with the games I've missed.

I'm surprised that you consider before 2012 as "old". You must be a zoomer. I've got a collection of CDs and cartridges going back to the early 1990s and here's a selection of some of the stuff I play:

Doom series
Descent series
Civilization series
Rollercoaster tycoon
Command & Conquer, Warcraft, Age of Empires
and a bunch more

A couple of oddballs I go back to every now and again are Wordtris, Final Fantasy 5, and some Jeopardy and Wheel of Fortune games and the DOS version of Classic Concentration.

Sometimes I replay old RPGs that I have good memories of, like Gothic. This year I played the old Divine Divinity series from GOG with full HD support. Still great stuff.

I also play Quake and Doom II every few years when there are enough new mods,maps and engines again.

Good topic. Looking on steam, games that I'm actively playing from before 2012 include:
Super meat boy
Sonic Adventure
Portal 2
Terraria

And then I still play No one lives forever 1 and 2 some times and Battlefield 2 with the kids.
On the console front, there are plenty, still play through Paper Mario on my gamecube every few years, and pull out other classics to play with the kids from time to time.

still playing ultimate mortal kombat 3 on mame and gens emulators