Currently Online 
This is impossible to choose one for goty.
Arkanoid was an instant classic which is still everywhere and can now be played in VR
Pong meets Arkanoid in C-Smash, which is now a VR title:
It's another classic I doodled into a game at work. From 2003 we were working with dedicated hardware for TomTom Navigator.
These standalone devices:
I've got the old dev kit ones still sitting on my shelves, the ones on the right were the early versions. These had tilt sensors in them which were popularized by the Wii. The sensors work by measuring the direction of gravity to deduce which way the device is tilted. They were in there to measure the movements of the car for the purpose of dead reckoning. When the GPS signal is lost, the movements of the car created the path, detecting turns.
It wasn't all that accurate and after 30 seconds it became unreliable at best, yet good enough to keep the thing alive through tunnels. (But no good for parking garages). That sparked me to experiment with with the motions sensors and make some little games for the device, a table maze, arkanoid/breakout game and a procedural flyer (steering a ship up and down through a generated tunnel, sidescroller) The games were easter eggs, accessible from the about screen by pressing 3 of the corners of the screen in sequence.
It worked beautifully, if only we had patented tilt controls back then in 2004!!! When the Wii and PS3 came out it was: 'Wait a minute' we did that 2 years ago lol.
Bubble Bobble: another evergreen title like Tetris, likely sparked by the success of Tetris.
Outrun: Indeed a smash hit, it was the focal point of any arcade I went to, later replaced by Turbo Outrun. I played that so much I could easily finish the whole thing on 1 dollar. Pretty good value for an arcade cabinet. Outrun was great on PC as well, played it to death. It was no doubt the inspiration for Lotus Esprit Turbo Challenge on the Amiga 500
That was our favorite when I went over to a friend to play in split-screen. We played that so much, as well as the sequel.
Might and Magic created a long series which I joined from the 4th one. Another colleague and friend and work played it as well and we were always comparing notes at work. It was the water cooler subject for months after a new version came out. And currently I'm playing TotK might and magic style, clearing the land of all evil (suppressing blood moons). Might and Magic didn't respawn anything so you could clean up the land! You could get so OP with spells that you could clear an entire zones with one spell at the end.
Castlevania I never played that much, but wow what a game. Another evergreen as Switch and Steam got another Castlevania collection just 2 years ago.
https://www.nintendo.com/en-ca/store/products/castlevania-advance-collection-switch/
Dragon Quest, the other final fantasy as I call it. Reminds me I still have DQ8 sitting in my backlog lol.
The Legend of Zelda, nothing needs to be said there, still robbing me of all my spare time!
Metroid is just as much a title that will stick around forever. I need to make time to play Metroid Dread, not enough hours in the day!
1986 birthed so many evergreen titles, it rivals 1998 for best year in gaming.
I have to give the nod to Zelda as that has turned into the biggest system seller of all.
