A strange little side quest
If Vanish Rain sends you down a curiosity rabbit hole, start here. Gun Fight reached arcades in 1975 and became the first arcade video game to use a microprocessor. There is another connection worth keeping in the same mental pocket: Midway's Gun Fight from 1975 was the first arcade video game to use a microprocessor. The details change, but the appeal of learning a system and trying again is remarkably persistent.