I.e., games that hooked you in and you couldn’t stop playing until it was finished. Not games that just happened to be unexpectedly short. And by “completed” I guess I mean the main story etc, not 100%ing the game :).
For me, it would be Catherine, Bioshock Infinite and Black Mesa (although I think I got to the final area then had to go to sleep and complete it the next day). I also played an ungodly amount of Hades in one sitting, but didn’t get the “full” ending in one day.
Inside!
Not quite one sitting but very quickly: Ori and the Blind Forest, Maneater
Sleeping Dogs pulled me in real hard. I‘m super salty there‘s no Sleeping Dogs 2, I loved everything about this game.
If any of you like GTA style gameplay, Sleeping Dogs is that plus kung fu movie flair (even has a cheesy king fu story DLC).
Nioh, Nioh 2, Code Vein, Dark Souls 2 (I know), Fairy Fencer F, and Ni no Kuni 2 also put me in chains. Crusader Kings III has no real story but it made so many evenings disappear that I try to legit stay away from it lol
Inmost - short platformer/metroidvania game with a brutally emotional storyline.
Far: Lone Sail - short puzzle/platformer game. Chill as fuck, great atmosphere and music. Story is only really gleamed from the environment that you traverse.
Cataclysm Dark Days Ahead. Because I usually die in like the first week in game lol
Return of the obra dinn. Both because it’s good and because I was worried my train of thought would be interrupted if I took a break. Took me ~9 hours and gave me a really bad headache afterwards, no regrets.
Primordia.
The Excavation Of Hob’s Barrow.
System Shock (1994).Portal 1
Yeah, Portal 1 & 2 for me.
Well the writer said yes to 3 but we need valve.
What Remains of Edith Finch. I ended up in tears after playing it. So beautiful.
Also on Android Monument Valley and its sequel. Mesmerizing games.
Portal 2
Stray.
antichamber literally kept me up all night until I finished it at 9am
Carrion. I was surprised how much fun it was. There’s some nice but not overly difficult puzzles and some frantic bursts of combat
I wanna say Yoshis Island for SNES but it was so long ago I don’t remember if it was one or two sittings. Dunno about the “that was so good” part though. Just completed it :)
Half life 1 and portal 1