Had to look it up to check its dates as a kid they only sold rip-off NES machines here, but the oldest game, i enjoyed playing, I found by date was Dig Dug, 2D game where you dig tunnels to get to all the enemies and defeat them by what I can only describe as throwing a bicycle pump nozzle into their mouths and pumping it until the enemy pops like a balloon.
There is the usual like Super Mario Brothers, Contra and I recall playing something where I think Diddy Kong throws barrels and “mario” has to avoid it to save the tied up princess behind diddy can’t recall the name
There is also Bomberman, Lode Runner, Double Dragon( specifically 2), Arkanoid, Ice climber (co-op) and a game I really enjoyed called Operation Wolf
Oldest original game is most probably Pac Man, but prefered the “3D”-like one which allowed pac man to jump in the maze which is newer.
Edit:
My bad, oldest game played in 2024, hmmm, Heroes of Might and Magic 1