Planescape: Torment - Enhanced Edition

If you like going deep into the lore of the Dungeons and Dragons multiverse then I can't think of a better game for you. However, if you're looking for fun gameplay, it's better to look elsewhere because Planescape Torment isn't a fun game; it's an immersive one and it tries to tell a story that's utterly depressing but in the end, we read it because we care about the mysterious nameless one.