Half-Life

Chrono Trigger - SNES, 1995

Super Mario Bros 3 - NES

Doom

The Legend of Zelda: A Link to the Past (SNES)

Starcraft

The Legend of Zelda: Ocarina of Time - Nintendo 64

Command & Conquer: Red Alert (PC)

Space Cadet 3D Pinball (PC)

(tell me you didn't just hear that sound in your head)

Super Mario World. The perfect platformer.

Castlevania Symphony of the Night - PlayStation

Super Metroid - SNES

SkiFree (PC)

Tetris - Gameboy

Goldeneye - N64

Final Fantasy 7 - PlayStation

Unreal Tournament

Bubble Bobble, Arcade, 1986

Donkey Kong Country - SNES

Final fantasy 3/6 - SNES

The Legend of Zelda - NES

Diablo (1996?)

Super Mario Bros. - NES

Street fighter 2 - hyper fighting edition (arcade).

Played this every day after school for years as did a huge portion of my school.

Master of Orion - MS DOS, Mac OS

Warcraft 2

The Legend of Zelda: Links Awakening

The Legend of Zelda: Majora's Mask - N64, 2000

Quake 2, PC

Baldur's Gate, both 1 & 2 on PC (I prefer #1). I had to actively consider whether it had been at least 25 years it came out and...I feel super old now 😅.

Pokémon Crystal is just shy of your 25 year threshold depending on what month it was released (it came out in 2000 in Japan), so I'll say Pokémon Yellow or Pokémon Gold and Silver. We can sit here and nitpick about which is the best, but Red, Blue, Yellow, Gold, Silver, and Crystal were all amazing.

Tetris - Game Boy

Wipeout 2097 (Wipeout XL), PSX, 1996

Super Mario Bros. 3 - NES

Final Fantasy 4, SNES.

(Still one of the best games I've ever played.)

Earthbound - SNES (with the oversized box and guide)

Dune 2, PC

Duke Nukem 3D, PC

Elite - BBC Micro Model B originally.

Pirates!

Tie Fighter PC/Mac

Fallout 2

Commander Keen (series), PC

UFO (or xcom) - enemy unknown.

Spyro (series) Playstation 1998-2000

I’ll propose Age of Empires 1. That one is my childhood pretty much 😄

Metal Great Solid