Tetris. That game has aged extremely well. I played it on the original Gameboy. I last played it on a VR headset.
Retrogaming
Playing games on or emulating past-generation computers and consoles.
The most obvious answer: the original DOOM. It's a game that does what it does so well that it is literally the template for an entire genre, and it still holds up as well today as it did the day it released. DOOM II is every bit as good. The two games have been ported to just about every device imaginable. If it has a screen, DOOM it. The DOOM community is still active to this day. Hell, John Romero released Sigil, the unofficial fifth episode of DOOM and widely regarded as the best, in 2019.
Symphony of the Night. I played it for the first time a few years ago, and it holds up really well next to modern metroidvanias, better than Super Metroid IMO.
Super Mario World and Advance Wars