Duarte, CA
I've only been able to play these games at a yearly big show, none of them have ever been at my regular locations, so I'm not too familiar with them, but I'd say Defender. The integration of the video game's rules with protecting the humanoids from the landers and the smart bomb button is very cool.
It would've been cool to see more video game pins from Williams at the time, like this and Joust. A while back I thought up a Sinistar pinball that would have a big sculpt of Sinistar himself up at the top of the playfield, kind of like Grand Lizard.
