For me it would have to be Subnautica.
I thankfully went into it really knowing nothing more than "survival game at sea" and the joy of finding and exploring new places and piecing together the story as you go, coupled with the sheer terror of the dark depths and swimming swimming swimming... wait, what's that? No, seriously...WHAT. IS. THAT?!?!!? GetBackInTheSeamoth, GetBackInTheSeamoth!!!
I'm swimming along. I find this neat area I'd never been to before just NW of some big mushrooms.
PDA: "Detecting several leviathan-class creatures in the area. Are you sure whatever you're doing is worth it?"
Me: "Huh? You mean a bunch of those Reefback things?? No worries..they're like whales."
Reaper Leviathian: "RooooooooaR!!"
PDA: "You have died and lost some belongings."
“This you have to understand. There's only one way to hurt a man who's lost everything. Give him back something broken..” -Thomas Covenant the Unbeliever