Subsurface Circular

Text-based detective game set entirely on a subway train. You're a robot investigator questioning passengers to solve the disappearance of fellow machines in an underground transit system. Conversations branch based on your dialogue choices, letting you press witnesses, gather clues, and piece together what's happening to the city's robotic population. The entire story unfolds through these exchanges—no walking around, no combat, just talking and deducing. It's short, wrapping in 2-3 hours, with the mystery escalating from missing persons to larger implications about the world above ground. Works if you want a focused narrative puzzle without filler, though the rail-bound setting means zero exploration.