I dunno man I see a couple in this list like Minecraft for sure, I’ve never played it personally but that doesn’t stop me from recognizing its impact on gaming and society in general. GTAIII set a standard from what we expect from games that is still being adhered to today; not just the gameplay open world stuff - the dialogue, music, and that feeling you could be watching a movie instead of playing a game. Halo for sure had an impact on me, especially from a multiplayer perspective and what was possible on console for multiplayer. Halo 2 gave rise to Xbox Live and that impact lives on today though and I think CounterStrike before Halo set the standard for first person shooters for me. I feel like Metal Gear Solid 4 should at least be spoken about here and also StarCraft 2 which laid the foundation for esports imo. I don’t think I could just settle on one game there are so many that had huge impacts