I don't think this is what you meant, but I remember the night a friend of my dad's came over and installed Doom (shareware) on our computer with floppy disks. I remember not being allowed to play it at first and then, when I finally was, being mesmerised by it. Up until that point I'd been playing Wolfenstein 3D and thought that was as good as it gets. Textured floors, ceilings, stairs and exploading barrels blew my little mind.
So my tradition is that some version of Doom I or Doom II is on basically everything I have. Android (Delta Touch as I love the voxel mod), Switch, Steam Deck - whenever I have a free moment and want to play something but I don't know what it is, I probably bash out a few levels of Doom.
It's perfect to just pick up and play and for some reason I never grow tired of it... which is weird as I generally don't replay games unless I really like them.