Planescape: Torment, which took computer roleplaying game tropes and turned them on their ear.
For example, death was not only not the end of the game, but necessary towards revealing the rest of the plot. The game was also one of the wordiest games ever, with tens of thousands of lines of dialog.
Black Isle Studios closed and reformed for the most part as Obsidian Entertainment, and CEO Feargus Urquhart has tantalizingly stated he wouldn't mind revisiting the 1999 game.
Urquhart told Play Magazine, “There are almost no games in my past that I wouldn’t want to go back and make a sequel to. It’s hard though," then added, “I remember right after finishing Planescape: Torment I spoke to Chris Avellone (Obsidian creative director) and asked what he wanted to do, and he was like, ‘I don’t wanna do a sequel!’ We haven’t talked about it in ten years, but it might be different now. But a lot of revisiting old games is about saying, ‘okay, that worked in 1999, what would work now?’ And how would you do it again?”
On making a sequel, Urquhart warned, "We’d have to think a lot about it, because it would have to be done right, otherwise the fans of the original would be pissed off and new people wouldn’t get it. That would be terrible."
So, a sequel is in Obsidian's minds. Question is, is it something you would like to see? And if so, would it star The Nameless One - whose story was fully told in the first game - or someone new? A game starring Morte, perhaps?