What would you consider to be the greatest games of all time?

I was thinking of what games were all-time-great, must-play-atleast-once-in-your-life games, since I'm relatively new to pc gaming.

I came up with games like Undertale, RDR2, and stuff like that, but I was wondering what the r/steam community thought

Here is my criteria:

1. Not a Massive Multiplayer online shooter (eg, Fortnite)

2. On steam right now (or a similar launcher)

3. It is still GOAT level now (not great on release then made shite)

Al contributions are appreciated ❤️