Colossal Cave Adventure (1976)

Use the classic Crowther and Woods 350-point text version for a recognisable starting geography. Similar-looking cave rooms become distinguishable when you record their exits and the objects you leave as landmarks. Dwarves and other events can vary without turning the whole cave into a newly generated world. Versions of Adventure differ greatly, so label your map with the version you are playing. Later graphical remakes are a different navigation experience.