A strange little side quest
If Zombie Escape: Horror Factory sends you down a curiosity rabbit hole, start here. Early computer role-playing games helped turn rules, inventories, exploration and character progression into systems that could support long-form digital adventures. And the history keeps stacking up: Spacewar! appeared on MIT's PDP-1 in 1962 and became one of the earliest influential computer games shared among programmers. The details change, but the appeal of learning a system and trying again is remarkably persistent.