For me, if I could forget any game and have the joy of replaying it "for the first time" all over again, I'd struggle to choose between the Mass Effect trilogy and Dragon Age. When I very first played I fell in love with all the characters, the worlds, the massive dialogue systems, the choices you could make that could make new playthroughs completely different... I spent so many hundreds of hours just lapping it all up.
The best gaming experiences I've ever had. 😊