I can recommend a couple joints I found on my last trip.
Circus Circus has a pretty sweet arcade, lots of older games and some newer stuff you don’t see outside of Japan often, like F-Zero AX.
The Pinball Hall of Fame is also worth a trip. Tons of pinball machines going back into the 50s, plus some arcade machines in the back.
Address there is 3330 E. Tropicana, Las Vegas.
I believe someone else already mentioned the NY NY arcade? I guess they’re good too, but I didn’t hit em myself.