It would be some of my earliest games. Since I started with Master System, going back to Hang-On, The Ninja (which I sadly traded away back then), Tennis Ace, Slap Shot, Rampage and the likes do really take me back. The real winner might be Phantasy Star, the best SMS game, the cave music certainly never gets old.
Some of old Lucas adventures are among top candidates, for me particularly first Monkey Island and Loom. But knowing them by heart, it's not really playing anymore with those.
My absolute favorite Wing Commander is a game I've played annually for 30 years and there is always both thrill and warmness.
Couple later things would be Okami and Sega GT (especially one of the Night Section tracks, was it A or B, the one with a power ballad BGM).







