I think my purest moment of gaming bliss was experiencing completely blind the last handful of worlds in Super Mario Odyssey while buzzed with a few whiskeys. God, my soul was in orbit with that experience. Pure, unfettered joy and whimsy through and through and cinematically epic when it wanted to be. I wouldn't call it the best game ever or even my favorite game ever, but god damn it, it struck me just right way at just the right time. It was something truly special.
More games I will cherish will certainly follow, and have followed. But for that specific set of vibes and circumstances, I don't know if I'll ever top that peak from playing a video game ever again.