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.
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