Probably Pac Man or Ms. Pac Man/Galaga. I have some good memories with the star wars game, track and field, and a weird version of dig dug for arcades. I'd probably go for the Ms. Pac Man/Galaga combo for value.
Mendel Palace. The forum is just me talking about this game, no replies, desperately searching for someone else who has played this hidden gem. To this day, I have found none. I'm not even sure if the people who made the wiki are real, or if they're alternate accounts of mine.
I played this game a ton as a kid though at my grandmother's. She had an NES so we could have something to do, and this game was one of the better ones. It's fucking TOUGH when you get to the end, though.