Well, if you’re interested in text-based games, there have been custom languages for a long time. https://www.linusakesson.net/dialog/craverly/craverly_side_by

Well, if you’re interested in text-based games, there have been custom languages for a long time. https://www.linusakesson.net/dialog/craverly/craverly_side_by_side.html https://www.linusakesson.net/dialog/craverly/craverly_side_b... Also LPC for muds, although that definitely wasn’t built from the ground up.