Off topic, but maybe vaguely amusing story:
When I read the topic title I thought you meant connected like NBA Fastbreak, where two pins would be connected locally. That's still an interesting idea to me, because it solves much of the cheating and setup issues if both games are physically next to each other.
Anyways, back in a simpler time, when Heighway wasn't a mess and Andrew and I were still talking and the future for Alien seemed brighter there was actually serious talk of Heighway going after the Predator license. I was against it personally, seemed like borrowing bad vibes, but Andrew thought maybe he could entice the Predator buyers or something by actually making a game. It obviously went nowhere, and for the best given what happened afterwards.
But during the time when the idea was kicked around I pitched something where if you owned both Alien and Predator you could link them together and play a special Alien vs Predator mode that would only occur when the games were connected. A ridiculous easter egg, but it would have been pretty cool.