That was followed by shows such as My Generation and Paranoia, which shot entirely in a big green room to facilitate a virtual set.
I'm glad that virtual game show sets were short-lived.
I imagine what TTD did with its Apple II computers was pretty high-tech for 1978, esp. for Beat the Dragon. Same for the setup on Bullseye.
When the current Jeopardy! premiered, that electronic game board had everyone talking. All of the sets used on that version, have, for the most part, been built on that foundation (although the JEOPARDY! letters are long gone).