A strange little side quest
Put Call of Zombies next to the history of action games and a few unexpected connections appear. Doom changed game design and distribution in 1993 by separating its engine from content and spreading widely through shareware. The surprising part is how quickly the next milestone followed. In 1958, Tennis for Two used an analog computer and an oscilloscope to turn simple physics into a playable tennis-like demonstration. It is a good reminder that simple game mechanics can carry a surprising amount of history.
