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.
The standout example of this for me would be Qube. I was having a bit of a difficult time when I first bought the game and that soundtrack lured me in and getting through to the end just became a total compulsion. I was a lot calmer by the time it was over, too.
Kairo had a bit of a similar effect on me, except that the very last jump in the whole game just would not work, spoiling the zen. Quantum Conundrum also got a full playthrough in one sitting but tbh I think that was because I wasn’t enthusiastic about coming back to it another day.