It just barely makes the cut off since it came out in 99, but Sid Meier's Alpha Centauri is my favorite strategy game of all time. It even managed to get a Linux port and you can get it on GOG. I was excited when Civ: Beyond Earth was announced that it would be a true successor, but sadly it wasn't even close.
RetroGaming
Vintage gaming community.
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If you see these please report them.
H.E.R.O.
Atari 2600
Castlevania: Symphony of the Night
Edit: nevermind, this was already posted. I literally did a search on the page first and it didn't match for some reason.
Legacy of the Wizard - NES aka Dragon Slayer IV Drasle Family - MSX
Galaga
Zork
Freelancer, PC
A great pick, but it's not 25yo yet, tho
I am very sad that I've scrolled several pages and haven't seen the obvious one (though I could just be blind):
Deus Ex.
Edit: or perhaps it's because Deus Ex is from 2000 and I don't know if it counts yet. Maybe I'll wait 'til next year!
Thief (1998)
Suikoden
Dance Dance Revolution.
(Do you feel old now?)
Sonic the Hedgehog 2 - Mega Drive
My first game ever.. good times
Phantasy Star IV
Final Fantasy Tactics
Metal Great Solid
Bubble Bobble, Arcade, 1986
Great, now I'll have the music from this game stuck in my head all day