Uses (random) map/level generator to create most or all areas where the player can go to instead of shipping with regular human designed static levels or maps.
Alternate names: Random map generator, Procedural map generator
Name variations: level generator
The first video game about Map generator was released in 1975.
This usually improves replayability since the areas (likely) don't share the same layout with each playthrough, but tends to fall short in other aspects.