Border Zone on the Commodore 64 is an Infocom interactive fiction thriller set in a tense Cold War Europe, told across three linked scenarios in which you successively control an American businessman on a train, a Western secret agent, and finally an Eastern bloc operative. Each chapter covers the same assassination plot from a different angle as you sneak through border towns, trains, and military zones, trying to prevent (or carry out) the killing of a visiting diplomat. Unlike most Infocom games it runs in real time—characters move and events unfold even if you hesitate—so timing your actions, lying low when patrols come by, and coordinating moves with the ticking clock is as important as traditional text-adventure puzzle solving, giving it a more cinematic, espionage-novel feel.