Planescape: Torment.  Made with the Forgotten Realms: Baldur’s Gate engine, but significantly more plot focused and less about combat.  It almost plays like an adventure game.

It has a similar feel and presentation as the movie Momento.  However, it came out well before Momento.  Great writing overall, and great dialog.

Here are some of my previous posts on it:

https://www.donttellmetheending.com/2008/02/02/planescape-torment-is-the-greatest-game-every-made-know-that-it-was-made-too-early/

https://www.donttellmetheending.com/2008/02/04/planescape-torment-the-book/

https://www.donttellmetheending.com/2008/02/12/can-games-tell-stories-why-or-why-not/

https://www.donttellmetheending.com/2008/11/18/planescape-torment-quote-of-the-day/