tetris, because it is tetris

pong, and probaly other examples of early home console games

wolfenstein3d, doom, quake, quake3, doom3 because all of them were technical milestones, had lasting impact on the industry and they show the rapid advancement of pc gaming in the 90s and 2000s

the elder scrolls series, as a simmiliar showcase.

final fantasy 1, 6 and 7, as a showcase of jrpgs through various generations and the fmv of 7 and onwards were imho precursors of 3d rendered movies.

half-life, because of the impact of it's scripted set pieces and its level design

counter-strike and starcraft, as the games that probably gave us professional e-sport.

dota, because its for mobas what doom is for first person shooters.

deus ex and thief, pioneered the "immersive sim" and they are great showcases of the interactive nature of games

Pokémon, cultural impact can't be denied and the trading aspect is a great example of a non traditional multiplayer experience

various Mario Games, but definitely Mario Bros. Super Mario World and Mario 64 and probably Galaxy as a showcase of the evolution of plattformers in 2d and 3d, maybe throw a spyro or banjo kazooie in there.

Grim Fandango, Kings Quest, Monkey Island, point and click adventures are there very own beast and often feature actual memorable characters. I definitely think more often about Manny Calavera than i do about Gordon Freeman or any Morrowind NPC, even though i played half-life and Morrowind much more than Grim Fandango

Minecraft

super meat boy, fez, hollow knight... lots of interesting indie games and they show how much more accessible game development has become.

Prince of Persia and karateka, the way they were animated alone would be enough, but they also featured an actual story, they were interested in showing and featured music used simmiliar to a movies soundtrack.

probably much more

games that are a product of a very localized culture (gothic could not have been made anywhere else but the ruhrarea for example)

the whole military complex is missing (from Mil Sims like Operation Flashpoint to actual recruitment vehicles like Americas Army)

more modern games, which i just don't know or that have not been rattling around in my brain for long enough, but baldurs gate 3, the last of us, or alan wake would probably end up on my list in a couple of years.